Revert "[Base]: recents panel clear all button tweaks"

This reverts commit a647d3b5db07e1a7840ca5920e4a6ab71758aa95.
Revert "Fix up 'clear recents' UX."

This reverts commit 132690a15c0ce1f4d08d5293a55243ccb478d126.
Revert "Fix - place Clear Recents button above the nav bar"

This reverts commit 74c78cf5fb6077cc21664640c04ccfa209cdfe40.
Revert "Add clear all recents action to recents panel"

This reverts commit a7a3df82e025e36780e2014e3d0f1a11e675149f.

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