Add ruleset icon to expanded score panel

[smoogipoo]

Not entirely sure we need this, but now that scores in multiplayer can be played on arbitrary rulesets I think it makes sense to display this somewhere. It sits between the star rating and mod displays:

What about the contracted panel?

I haven't added it to the contracted panel because I don't know where to fit it in. Also the beatmap isn't displayed there (which is also per-user in freestyle rooms), and I just think the design is in general inadequate for displaying so much info? Here's one of my attempts:

diff --git a/osu.Game/Screens/Ranking/Contracted/ContractedPanelMiddleContent.cs b/osu.Game/Screens/Ranking/Contracted/ContractedPanelMiddleContent.cs
index cfb6465e62..b2709670a0 100644
--- a/osu.Game/Screens/Ranking/Contracted/ContractedPanelMiddleContent.cs
+++ b/osu.Game/Screens/Ranking/Contracted/ContractedPanelMiddleContent.cs
@@ -11,13 +11,15 @@
 using osu.Framework.Graphics.Effects;
 using osu.Framework.Graphics.Shapes;
 using osu.Framework.Localisation;
+using osu.Game.Beatmaps.Drawables;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Online.Leaderboards;
 using osu.Game.Resources.Localisation.Web;
+using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Scoring;
+using osu.Game.Rulesets.UI;
 using osu.Game.Scoring;
-using osu.Game.Screens.Play.HUD;
 using osu.Game.Users;
 using osu.Game.Users.Drawables;
 using osu.Game.Utils;
@@ -134,14 +136,33 @@ private void load()
                                                 createStatistic(BeatmapsetsStrings.ShowScoreboardHeadersAccuracy, $"{score.Accuracy.FormatAccuracy()}"),
                                             }
                                         },
-                                        new ModFlowDisplay
+                                        new FillFlowContainer
                                         {
                                             Anchor = Anchor.TopCentre,
                                             Origin = Anchor.TopCentre,
-                                            AutoSizeAxes = Axes.Y,
                                             RelativeSizeAxes = Axes.X,
-                                            Current = { Value = score.Mods },
-                                            IconScale = 0.5f,
+                                            AutoSizeAxes = Axes.Y,
+                                            Direction = FillDirection.Full,
+                                            Spacing = new Vector2(3),
+                                            ChildrenEnumerable =
+                                            [
+                                                new DifficultyIcon(score.BeatmapInfo!, score.Ruleset)
+                                                {
+                                                    Anchor = Anchor.TopCentre,
+                                                    Origin = Anchor.TopCentre,
+                                                    Size = new Vector2(20),
+                                                    TooltipType = DifficultyIconTooltipType.Extended,
+                                                    Margin = new MarginPadding { Right = 2 }
+                                                },
+                                                ..
+                                                score.Mods.AsOrdered().Select(m => new ModIcon(m)
+                                                {
+                                                    Anchor = Anchor.TopCentre,
+                                                    Origin = Anchor.TopCentre,
+                                                    Scale = new Vector2(0.3f),
+                                                    Margin = new MarginPadding { Top = -6 }
+                                                })
+                                            ]
                                         }
                                     }
                                 }

Also tried a little bit of a more wanky direction (check the top of the panel), but I'm not pleased with how it looks:

Would probably need some direction from @ppy/team-design.

[peppy]

For the contracted panel, I think displaying it where you have it looks fine, but might not if there are too many mods. Another location would be next to the rank grade at the bottom, but I'd only want it there in the case where the results screen didn't have all scores from the same ruleset (which maybe says that it's not a good place to have it, I dunno).

[peppy]

Going to apply your patch to contracted panels as I think it's a good first step. Functionality over design for now.

I think a future effort could see these icons only displaying on users with overrides from the ResultsScreen beatmap / ruleset.