Fix cursor not disappear immediately when the mouse device removed

Bug: Turn on show touches in settings, then connect mouse device,
move mouse, when cursor appear, remove the mouse, the cursor not
disapper immediately.

Fix method: Call fade method in PointerController when cursor input
mapper destruct.

Signed-off-by: lilinnan <lilinnan@xiaomi.corp-partner.google.com>
Change-Id: Ib4251993dc83020bd85badea17a118840c1518d7