Fix divider flicker from swiping up from a pip->fullscreen app on top of split
When swiping up from the pip->fullscreen app, the splitscreen visibility state isn't updated causing the divider to be brought to front. Fixes: 289753648 Test: manual Flag: EXEMPT bugfix Change-Id: I86d40968bcd0f24c2c1846eea64041d766852fdb
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