Fix style of new setter and refer to new value in desktop_nav

src/App.js

@@ -92,7 +92,7 @@ export default {
     editingAvailable () { return this.$store.state.instance.editingAvailable },
     layoutType () { return this.$store.state.interface.layoutType },
     privateMode () { return this.$store.state.instance.private },
-    showPublicExternalTimeline () {return currentUser() || !(privateMode || this.$store.state.instance.restrict_unauthenticated.timelines.federated)},
+    showPublicExternalTimeline () {return currentUser() || !(privateMode || this.$store.state.instance.restrict_unauthenticated.timelines.federated) },
     reverseLayout () {
       const { thirdColumnMode, sidebarRight: reverseSetting } = this.$store.getters.mergedConfig
       if (this.layoutType !== 'wide') {

src/components/desktop_nav/desktop_nav.vue

@@ -67,6 +67,7 @@
             />
           </router-link>
           <router-link
+            v-if="showPublicExternalTimeline"
             :to="{ name: 'public-external-timeline' }"
             class="nav-icon"
           >