Propagate apply flags to nested RemoteViews

This change propagates FLAG_WIDGET_IS_COLLECTION_CHILD and
FLAG_USE_LIGHT_BACKGROUND_LAYOUT to nested RemoteViews (either added by
addView, or set as portrait/landscape/sized RemoteViews) if that flag is
also present on the parent RemoteView.

For FLAG_WIDGET_IS_COLLECTION_CHILD, this prevents a PendingIntent from
being set on a RemoteView that is a child of a collection item RemoteView.

For FLAG_USE_LIGHT_BACKGROUND_LAYOUT, this ensures that nested
RemoteViews use their light background layout if this is set on the
parent.

Bug: 214288099
Test: RemoteViewsTest
Change-Id: I8da92d0d338631a99ee718a136bf9674827437bb