Inline last call to ShadeViewController.disableHeader

Also moves initialization of ShadeHeaderController to ShadeStartable
along with some other start up code that didn't belong in
ShadeController.

Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Test: Updated and ran affected test
Bug: 303267342
Change-Id: Ib19e447b85b383d447bec2abc60833e77db5d63d
14 files changed