Override actionModeCloseDrawable in Theme.DeviceDefault.DocumentsUI

Since RRO do not support to override theme which indicate specific
attr to reference private resource at Q, defined actionModeCloseDrawable
in Theme.DeviceDefault.DocumentsUI can ensure all Q devices apply the
reasonable design.

Fix: 130209354
Test: visual
Test: atest DocumentsUIGoogleTests
Change-Id: I7751aaa753e92a860dc20b873967631a4070595e