Remove default styling properties that block vector rendering

[makella]

As discussed in this issue (CartoDB/carto.js#1670) and this issue (CartoDB/carto.js#1624) we have some default properties blocking vector rendering. Specifically, polygon-gamma and line-comp-op.

I think Auto-Style is actually the best use of these properties but I understand why we need to remove them.

Basically, we need to remove polygon-gamma and line-comp-op properties from here:
https://github.com/CartoDB/deep-insights.js/blob/master/src/widgets/auto-style/auto-styler.js#L41-L50

cc @donflopez @saleiva

[makella]

One thing we need to test is how we should modify the default Auto-Style CartoCSS with these properties removed.

I will test in Builder by modifying the Auto-Style CartoCSS to see what a suitable alternative is.

[makella]

So if we remove those properties, there is no effect the real problem with Auto-Style on polygons is still this unresolved issue with lines trying to ramp and not working:
#518

We should definitely test when modifications are made. For polygons, all we need is to not overwrite line-color when auto-style is enabled.

[xavijam]

Hey @makella, taking care of this one in #557. Closing this one!

Thanks! 💋 .