Advanced account settings page: Make handling of the codecs preference more clear [visually]
This issue is related to audio & video codecs section.
If a user doesn't select any codec, both the up & down arrow buttons should be greyed out by default -> like in GNOME Settings -> "Search" or "Region & Language" tab
If a user selects the codec listed on the top, the up arrow button should be greyed out. And if a user selects the codec listed on the bottom, the down arrow button should be greyed out.
Both for logical reasons.