IMS-VT: Fix UI stuck in full screen issue.

Sometimes InCallUi gets stuck in the full
screen mode which hides all call control
buttons. This happens since framework
doesn't call onPreDrawListener listener.
To fix the issue we explicitly call
onPreDrawListener callback.

Change-Id: I0fd40236a5af42774da8a453262869464fcb8e81
CRs-Fixed: 1025073