Fix footer-notif overlap after inline reply

Do not animate footer Y when showing IME so that after IME hides,
the footer appears at and continues animating from the correct Y.

Fixes: 327515087

Test: send inline reply
      => footer appears at correct Y with no notification overlap
         and continues animating Y with normal use:

      open shade, close shade, add delayed notif
      => footer Y animates fine

      clear last notif
      => footer hides fine

Change-Id: I2b062dc80cee9125df90f249087fb9cf1b41c18f