Keep metadata and buttons in the same position

it sets the seekbar visibility to invisible when it should be disabled.
So it keeps the space for the seekbar available which keeps the
positions of other UI components in the same original position.

Bug: 249989837
Test: atest MediaControlPanelTest
Test: Checked the new changes applied on UMO UI.
Change-Id: I77131a60bc6bce87e326828fe5d799538b19f16c