Ensure tabs wrap correctly on user profile page (#12144)

Co-authored-by: zeripath <art27@cantab.net>

web_src/less/_user.less

@@ -74,6 +74,9 @@
         #loading-heatmap {
             margin-bottom: 1em;
         }
+        .ui.secondary.stackable.pointing.menu {
+            flex-wrap: wrap;
+        }
     }
 
     &.followers {