show WSA when ready when using shell transitions

Legacy transitions seems to show WSA a frame after the
drawing finishes (updateAllDrawn runs after commitFinishDrawingLocked
and the condition canShowWindows() depends on allDrawn).

Shell transitions doesn't use allDrawn and instead uses
BLASTSyncEngine. So, don't delay WSA otherwise the WSA show won't
be on the sync transaction.

Bug: 230495892
Test: atest AnimationEdgeExtensionTests
Change-Id: I8b7596085e57b2e3ddaea05e6893b7099cd49e3a