UX: Display gap between tag sort options on PMs (#17342)

Adjust whitespace on tag sorting options so that the two links are rendered with a gap between them.

app/assets/stylesheets/common/base/tagging.scss

@@ -185,6 +185,7 @@ header .discourse-tag {
   margin-bottom: 20px;
   a {
     text-decoration: underline;
+    display: inline-flex;
   }
   span.active a {
     font-weight: bold;