fix warning about antiquated JS snippet

probably a relic from the merge script rebase

src/templates/partials/javascripts/content.html

@@ -37,10 +37,3 @@
       }
   </script>
 {% endif %}
-
-<!-- Switch to content tab target -->
-<script>
-  var target = document.getElementById(location.hash.slice(1))
-  if (target && target.name)
-    target.checked = target.name.startsWith("__tabbed_")
-</script>