[waitForAllWindowsDrawn] Wait for transition only with INVALID_DISPLAY

We never use DEFAULT_DISPLAY with waitForAllWindowsDrawn
function, so removing this check.

Test: atest DisplayContentDeferredUpdateTests
Bug: 353204414
Bug: 361466937
Flag: EXEMPT bugfix
Change-Id: I8fac2d246258bd67806c42db99a0da8641705c7d