Use different bg drawable for settings/history btn

This prevents the ripple touch effect from being shown on the history
button when the settings button is pressed.

Fix: 376634475
Bug: 375010573
Flag: com.android.systemui.notifications_redesign_footer_view
Test: press settings button and see that history button stays the same
Change-Id: Ifda076b8837704b84e5175cfc70a606e79eda78c