Fix app moving when screen is unlocked.

Fix the app moving to bottom right when the screen is unlocked
during desktop mode. This is fixed by blocking the relayout during
keyguard transition. Although this fix works, there is an underlying
problem with relayout that needs to be addressed. This can be found in
detail on  b/274674365.

Test: Manual
Test: atest DesktopModeWindowDecorViewModelTests
Bug: 296919650
Change-Id: I605bf7005c4a71d4a22193e25c7964b59e0db356