SystemUI: Fix QuickSetting IME tile

The IME tile reference need to be saved to used at setImeWindowStatus method

Patchset 2: Reset IME tile prior to load tiles

Change-Id: I185c37ed91794af93bd6f750c1e0c039c15f6696
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
QuickSettings: Honors config_show_cmIMESwitcher setting (1/2)

Change-Id: Ia93945cda1a7e491dd3f52c61623b3064624e575