Replaces unnecessary collectLatest with collect

When hydrating local MutableStateFlows, there's no need for
collectLatest, just collect can do. collectLatest has worse performance
characteristics so cleaning those up.

Bug: 354269846
Test: smoke test with flexiglass - visited every scene before/after
unlock and after relock
Flag: com.android.systemui.scene_container

Change-Id: Iccc30601f28c193832dcf3fb50688f224910ef09