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Uses back and home button for screen pinning when recents is invisible
All the text and screen pinning hint shows tells the user that the back and home button should be held to exit screen pinning. The hint also do not have the recents button shown if it is invisible. The toast code has been moved to recents and services calls through to post a toast message depending if the recents button is visible. Test: manual Fixes: 72059911 Change-Id: I93abf5072b97760f33e7e77421544a4b3ad27beb