Check parent frame instead of window bounds

In Task#calculateTopActivityMainWindowFrameForTaskInfo,
we previously regard an activity as a match-parent activity by
comparing the window frame to window bounds. It could be wrong
if the window frame excludes the inset.

This CL changes to compare with parent frame, which use the same logic
to exclude the insets area.

Test: none
Bug: 356277166
Flag: com.android.window.flags.better_support_non_match_parent_activity
Change-Id: I42c371783f421e1603b18fed283ccc231a03ad0d