Until now, many online textures were retrieved via the default texture store, which causes them to never be removed from GPU memory. It also has a performance overhead due to mipmap generation (which will be avoided via ppy/osu-framework#1885.
This fixes a failing test (hidden becaues the test wasn't being run). - [ ] Merge osu-framework#1530 first.
also fixes rotateBadges bug when hover is lost