[Dual Shade] Render the shade header clock based on the compose state.

This removes the shade header's dependence on the `isShadeLayoutWide`
flow, which will soon be removed.

Bug: 354926927
Bug: 338033836
Test: Manually tested by opening and closing both shades on both a
 folded and unfolded device, verifying the shade header clock appears as
 expected.
Flag: com.android.systemui.scene_container
Change-Id: I0daeefe767a9703dcc235b066a57c7da74735b44