Add Kill Switch section

Currently there's a nasty bug which doesn't allow users from navigating
from the "Kill Switch" section to any other section of the app (see bug
twpowertools:59), but everything else is working.

Change-Id: I3c71352b1899e4ddf9ba5886aa1434a5a1ed93eb
diff --git a/frontend/src/pages/AuthorizedUsers.vue b/frontend/src/pages/AuthorizedUsers.vue
index 2f2b326..1ba31e8 100644
--- a/frontend/src/pages/AuthorizedUsers.vue
+++ b/frontend/src/pages/AuthorizedUsers.vue
@@ -1,4 +1,6 @@
 <script>
+import {mapGetters} from 'vuex';
+
 import NotAuthorized from './NotAuthorized.vue';
 import Page from './utils/Page.vue';
 import AuthorizedUserDialog from '../components/AuthorizedUserDialog.vue';
@@ -14,8 +16,8 @@
 
     return {
       users: [],
-      currentUpdateUser: emptyUser, // Current user being updated
-      currentDeleteUser: emptyUser, // Current user being confirmed deletion
+      currentUpdateUser: emptyUser.cloneMessage(), // Current user being updated
+      currentDeleteUser: emptyUser.cloneMessage(), // Current user being confirmed deletion
       addDialogOpen: false,
       updateDialogOpen: false,
       deleteDialogOpen: false,
@@ -67,9 +69,9 @@
     },
   },
   computed: {
-    isSignedIn() {
-      return this.$store.state.jwtToken != null;
-    },
+    ...mapGetters([
+      'isSignedIn',
+    ]),
   },
 };
 </script>