Fix regression in updating gesture exclusion rects

- Only update the rects when the view visibility changes if there were
  previously set rects

Bug: 140157754
Test: atest SystemGestureExclusionRectsTest
Change-Id: Ica58de4ff43da75cfcdac3f359fc915f65608e78
(cherry picked from commit 3baffd871c1e1a0b9ab412f4e6a2ba11758c6076)
1 file changed