Refresh state when updating seekbar visibility

The issue was not with the comparison algorithm. It seems we used to
rely on media notification updates to update seekbar visibility. We need
to refresh the state to get an immediate update on seekbar to show.

Flag: EXEMPT bugfix
Fixes: 373533563
Test: Checked UI.
Change-Id: I997454739600aad9cfd46c8767fbd641025233c3