Remove some unused hotseat/qsb scaling code

Now that QSB is always part of Hotseat, we don't need
getQsbScaleAndTranslation(), and now that HOTSEAT_ICONS are never in
Overview, we can remove the getHotseatScaleAndTranslation() override

Test: Everything works as before
Bug: 175137718
Change-Id: I902815d8e270269c1a2a9af54fa8480e5aef929d
7 files changed