Cleanup
Revert "Recents Panel : option to add Google Assist Button (1/2)"

This reverts commit 17601a009c3778f67d381e30ccd59912f7766f1c.

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
	packages/SystemUI/res/layout/status_bar_recent_panel.xml
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java