Calculate hotseat width based on available width

Navigation buttons take space on the hotseat, so hotseat width (qsb width and border space between icons) should be calculated instead of having a coded value.

Bug: 223724516
Bug: 228998463
Test: manual, changing display size
Test: manual, changing hotseatBarEndOffset value
Test: HotseatWidthCalculationTest
Change-Id: Ibd4f5ff2e06afda8e7420fb744db049d2e418e14
13 files changed