Remove clear all button

Revert "Fix up 'clear recents' UX."

This reverts commit 927c946fb0330dd309992c91e171f43293860c88.

Revert "Fix - place Clear Recents button above the nav bar"

This reverts commit f7d50636a5162c993444b8ce35767ce7a799713d.

	Revert "Add clear all recents action to recents panel"

This reverts commit 8890169ecd24ebb1871f83abf255cebdc1929902.

Conflicts:
	packages/SystemUI/res/values/cm_strings.xml