Fix setSurfaceBehindVisibility(false) being ignored

The check is supposed to ignore visible=true calls when
isKeyguardGoingAway was already triggered by a prior visible=true call.
The false case was incorrectly ignored.

Bug: None
Flag: EXEMPT bug fix
Test: Manual transition check
Change-Id: I7c0e3bbc1e080e61aa07176845fc2704c6497f4e
2 files changed