Moving userIsAdmin check to tab

moved the check for userIsAdmin to the tab itself so the whole tab will not
show up unless you are an admin, before this change it would have the
telescope tab but it would be empty inside. This way is more logical

src/components/sitepages/SiteData.vue

@@ -56,11 +56,11 @@
           </b-tab-item>
 
           <b-tab-item
+            v-if="userIsAdmin"
             label="telescope"
             :value="'telescope'"
           >
             <div
-              v-if="userIsAdmin"
               class="obs-config-box"
             >
               <div class="obs-config-control-group">