Correctly position the landscape / rtl FloatingIconView's background drawable when swiping back to home.

Bug: 235812580
Test: Verified the correct "Swipe Back to Home" position for the
floating icon view in landscape and portrait (rtl and ltr for both
orientations) with a tablet. There is a screen recording on the bug.

Change-Id: Id06f43e70ef617e39e1b26d0c8b7466147e325d2
1 file changed