Fix activity start over Keyguard

Starting an activity over Keyguard was stuck in initializing
state because activtiy isn't visible yet. Instead, use
visibleIgnoringKeyguard to determine which activities to start

Test: KeyguardTests, KeyguardLockedTests,
Test: go/wm-smoke
Change-Id: I7dce1f2f1a2830012d2372db7e8655803251188d
Fixes: 64351094