[Media TTT] [a11y] hide container view before animation

Hide container view before animation to make a change in the view that
triggers the talkback announcement. It doesn't affect the UI because the
duration of showing view is 5.frames.

Fixes: 265635955
Test: adb command adb shell cmd statusbar media-ttt-chip-receiver CLOSE_TO_SENDER useAppIcon=false
Change-Id: I85cda7498870a359238c996bd4ff9167d01cd78d