Hide size compat restart button in unfolded fullscreen

For close to square displays where unresizable activities have similar
bounds in portrait/landscape orientation, we should hide size compat
restart button. Size compat button should still show when folding or
unfolding, or when entering/exiting split screen.

Bug: 318840081
Test: atest CompatUIWindowManagerTest
Change-Id: I894d2cde1de5eb40ac99ef63cad449585dfd8328