Don't apply rounded-corner animation on non-default display

Non-default displays usually don't have rounded-corners. It doesn't
make sense to apply rounded-corner animations on them. Besides, we
don't know if an external display has rounded-corners or not.

Bug: 131040127
Test: Follow the reproduction steps in the bug.
Change-Id: I0b892bfb50875eaa59b2bf5ba07074bb3494042b