Propagate the light background flag in RemoteCollectionItemsAdapter

Currently CTS test fails with `android.appwidget.flags.remote_adapter_conversion` flag on.

In the old adapter, it propagated EXTRA_REMOTEADAPTER_ON_LIGHT_BACKGROUND param in intent.
The RemoteCollectionItemsAdapter however doesn't know about it and causes the items to be inflated without the `FLAG_USE_LIGHT_BACKGROUND_LAYOUT` flag (even if the parent container has that flag).

Bug: 369181454
Test: atest FrameworksCoreTests:android.widget.RemoteViewsTest -- --abi arm64-v8a
Flag: EXEMPT testfix
Change-Id: I988dd8427b13003b56e60712e3211920a51add13