Comment 4 for bug 1846042

Working branch user/jeffdavis/lp1846042-admin-page-filters rebases Galen's commit to current-ish master. It works as well as before, but the issues I identified earlier remain unresolved. In particular, I was hoping that the commit for bug 1855931 (which is now in master) would fix column alignments for filters, but no such luck -- on Local Admin > Hold Policies, the filters are still so unaligned that you can't realistically use them on that page. We could commit the current fix and open a separate bug to address column alignments, I suppose.