Ensure that rounded corner radius applies on activity launches

For devices with round screens (e.g. watches), the rounded corner
radius should *always* apply regardless of whether the open
transition involves a task or not.

Test: manually check open settings activities on watch
      atest FrameworksCoreTests:RoundedCornersTest
Bug: b/323109476

Change-Id: Ie632a8226183e9261806e97f154ab3daed193033