Reset allAppsVisible if folding to phone upon recreateTaskbar.

For taskbar unification, we should reset this bit to false when folding
into phone orientation. Otherwise, we will reinit Taskbar AllApps over
the phone UI which is unexpected behavior.

Test: Manual
Flag: N/A
Fix: 293379641
Change-Id: I53c38c8b4df477191be3c21b7750c55a71c7336f
(cherry picked from commit 6d63e779)
Merged-In: I53c38c8b4df477191be3c21b7750c55a71c7336f