[flexiglass] Revert setting alwaysCompose for QS scenes and overlays

Enabling `alwaysCompose` on these contents makes them non-interactive (tiles, brightness slider, edit button not responding to touches).

Fixes: 433909610
Bug: 430488243
Flag: com.android.systemui.scene_container
Change-Id: I4dbab8c583bff9647efc42c02cb9778837a5f5f3