Fix disable backup policy not working issue (#1050)

Author: Sneezry

src/components/Popup/BackupPage.vue

@@ -96,7 +96,7 @@ export default Vue.extend({
       return this.$store.getters["accounts/currentlyEncrypted"];
     },
     backupDisabled: function () {
-      return this.$store.getters["menu/storageArea"];
+      return this.$store.state.menu.backupDisabled;
     },
     isDataLinkSupported: function () {
       return !isSafari;