Sleep 12 seconds to let potential BAL grace period expire.

BG-FGS while-in-use restriction uses the same 10 seconds grace period mechanism as BG-Activity-Launch,
starts from last activity's launch time or finish time.

Add 12 seconds sleep time to let the 10 seconds grace period from previous test to expire so it won't
interfere with current test.

Bug: 182400165
Bug: 184057310
Bug: 227214395
Test: atest cts/tests/app/src/android/app/cts/ActivityManagerApi29Test.java
Change-Id: Id4291d30b18ca7f5c9b8bece90fce94cbe2e8a90
Merged-In: I5d9056feeac05574f73bab9a9c1b37cd6aa881dd
1 file changed