UI: Sorting table on tags view adds hard-to-read background colour

It looks correct without any sorting.
Similar issue in the footer for the page numbers:
but there is actually more than one page, which you only see if you hover accidentally over that location:

Likely, this issue is only present in dark mode.
Can reproduce on Mozilla Firefox 102.9.0esr. Note that this happens only on "tag" pages, not on normal searches:

@peterbecich
I believe this fixes the sorted column background color: https://github.com/haskell/hackage-server/pull/1207 I have not looked at the other issues yet. Let's leave the issue open and solve those later. Please review.
More improvements: https://github.com/haskell/hackage-server/pull/1281