desktop-exploded-view: Calculate an accurate crop rect for desktop tasks

This change fixes crop rects on desktop tasks when exploded view is
enabled. The crop rect calculation now takes the current task rect
transform into account (which is used to position windows when exploded
view is enabled).

Flag: com.android.launcher3.enable_desktop_exploded_view
Test: Manual
Bug: 367353392
Change-Id: I2b296a5065a5bc74c8ba884f2329081546b40ad0