fix(auth.native): trigger conference left on cancel

Triggering the 'conference left' action when the wait for owner dialog
is dismissed will let the Call Kit implementation end the call, after
a recoverable conference failed event was emitted.

Also fixes conference state reduction when 'conference left' is emitted
by room lock or auth features where the conference has not been joined
yet.

react/features/authentication/actions.js

 // @flow
 
 import { appNavigate } from '../app';
-import { checkIfCanJoin } from '../base/conference';
+import { checkIfCanJoin, conferenceLeft } from '../base/conference';
 import { openDialog } from '../base/dialog';
 
 import {
  * @returns {Function}
  */
 export function cancelWaitForOwner() {
-    return (dispatch: Dispatch<*>) => {
+    return (dispatch: Dispatch<*>, getState: Function) => {
         dispatch(stopWaitForOwner());
+        const { authRequired } = getState()['features/base/conference'];
+
+        if (authRequired) {
+            dispatch(conferenceLeft(authRequired));
+        }
+
         dispatch(appNavigate(undefined));
     };
 }

react/features/base/conference/reducer.js

  * reduction of the specified action.
  */
 function _conferenceLeft(state, { conference }) {
-    if (state.conference !== conference) {
-        return state;
+    let output = state;
+
+    if (state.authRequired === conference) {
+        output = set(output, 'authRequired', undefined);
+    }
+    if (state.conference === conference) {
+        output = assign(output, {
+            conference: undefined,
+            joining: undefined,
+            leaving: undefined
+        });
+    }
+    if (state.passwordRequired === conference) {
+        // Note that in case the conference was joined those fields have been
+        // cleared already, so this step needs to be done only if the room
+        // unlock operation has been canceled and that's why it's not done in
+        // the 'state.conference' condition above.
+        output = assign(output, {
+            locked: undefined,
+            password: undefined,
+            passwordRequired: undefined
+        });
     }
 
-    return assign(state, {
-        authRequired: undefined,
-        conference: undefined,
-        joining: undefined,
-        leaving: undefined,
-        locked: undefined,
-        password: undefined,
-        passwordRequired: undefined
-    });
+    return output;
 }
 
 /**