When distributing scores evenly, sort scores ascending instead of descending

[AlexVasiluta]

Currently, if you have for example 3 tests and choose to distribute the score evenly when uploading a zip archive, the scores will be 34 33 33 instead of 33 33 34, which should be the expected output, since later tests are usually harder. This was introduced when adding fractional score to the backend and never fixed. We need to fix this