[flexiglass] Removes refactor_keyguard_dismiss_intent flag dependency.

refactor_keyguard_dismiss_intent was flagging work that's currently
depriotized so replacing it with the scene container flag.

Bug: 283121968
Bug: 275069969
Test: NA
Flag: NA
Change-Id: Ie7f2a849b8f64eb47cd868333d32b4142172108a