Update multi-select highlight color of list items with header.
Update multi-select highlight color of list items with header.

TODO: Refactor RecyclerViews so that the header is its own special type of
ViewHolder, instead of being baked into each item.

Bug: T185536
Change-Id: I2ecd9875ebd92255f940a68ddefbbca3471cecbb

dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia