Floating stacks should crop to their bounds

By removing bounds for floating stacks, it allows windows to get drawn
outside their stack bounds.

This reverts part of I972223a0198ec7a11529e39f5c85cfe94e3bab78

Bug: 131753585
Test: Stacks in SF are cropped to the window bounds
Change-Id: Ib4e8a06bbbbfee657d18f7ee9ae0e7dc4c962a61