Remove references to flag fold_grace_period_enabled

Test: atest PowerManagerServiceTest LogicalDisplayMapperTest
Test: atest KeyguardUpdateMonitorTest KeyguardViewMediatorTest
Fixes: 335160116
Flag: EXEMPT removing com.android.internal.foldables.flags.fold_grace_period_enabled
Change-Id: Ia1185a476d600ac317d760364a88c5c9bac73abb
13 files changed