Fixes showing video after waiting for owner. Fixes #3671.

conference.js

         // not enough rights to create conference
         case JitsiConferenceErrors.AUTHENTICATION_REQUIRED: {
             // Schedule reconnect to check if someone else created the room.
-            this.reconnectTimeout = setTimeout(() => room.join(), 5000);
+            this.reconnectTimeout = setTimeout(() => {
+                APP.store.dispatch(conferenceWillJoin(room));
+                room.join();
+            }, 5000);
 
             const { password }
                 = APP.store.getState()['features/base/conference'];

react/features/base/conference/actions.js

  * @returns {Function}
  */
 export function checkIfCanJoin() {
-    return (dispatch: Dispatch<*>, getState: Function) => {
+    return (dispatch: Function, getState: Function) => {
         const { authRequired, password }
             = getState()['features/base/conference'];
 
+        authRequired && dispatch(_conferenceWillJoin(authRequired));
         authRequired && authRequired.join(password);
     };
 }