Reduce talkback for the character counter

This removes ACCESSIBILITY_LIVE_REGION_POLITE from the character counter
view. Unlike the error view, the character counter is updated for every
change on the EditText. Marking it with LIVE_REGION_POLITE can cause
Talkback to announce the counter when the content of the EditText is
restored.

Bug: 27153318
Change-Id: Ie1be0891e931c6fd17482126f232d005fd2baa69
1 file changed