[Glitch] Fix superfluous border & spacing in domains list on the Moderation > Federation page

Port 72c582e7e5 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/admin.scss

@@ -327,9 +327,9 @@ $content-width: 840px;
       font-weight: 700;
       color: $primary-text-color;
       text-transform: none;
-      padding-bottom: 0;
+      padding-top: 0;
       margin-bottom: 0;
-      border-bottom: 0;
+      border-top: 0;
 
       .comment {
         display: block;