add locked_controls to settings clear.

src/component/main.vue

@@ -769,6 +769,7 @@
       Vue.set(this.state, 'sessions', {})
       Vue.set(this.state, 'settings', {
         private_mode: false,
+        locked_controls: false,
         implicit_hosting: false,
         inactive_cursors: false,
         merciful_reconnect: false,