Clear leave shade open on bouncer exit

Various points in the code may set the state to indicate that the
shade should stay open after unlocking. However, if the bouncer
is canceled via back gesture, the flag could remain on.

Fixes: 375969371
Test: atest StatusBarKeyguardViewManagerTest
Flag: EXEMPT bugfix
Change-Id: I973b1532624f12421d223f6241db1fea80d02c94