Fixes recents from disappearing when split and restarted

The launch flags are interpreted incorrectly when minimized causing
Recents to start an entrance animation by moving off screen and being
invisible when Recents is destroyed and shown again by density or font
system changes. When recents is restarted, reset the flags to ignore the
entrance animation from moving them off screen.

Fixes: 62195106
Test: Open settings, go to page to change font size, dock by holding
recents button, with at least one task in Recents, change density. Also
can minimize and unminimize and changing density would also get fixed.
Change-Id: I519f59faf5e98c9d116bf66297f033c7f5fb7138