Clear pending activity launches when force stop package

https://code.google.com/p/android/issues/detail?id=223731



It is possible that an activity in pending launches be resumed while
it's package was stopped by some other reason, like uninstall pkg.

Test: Current tests pass.
Change-Id: I130ded89cee162aa59ac2bf330f026e49e16ef69
Signed-off-by: liulvping <liulvping@xiaomi.com>