Fixes push to talk.

conference.js

         //accessing directly eventEmitter????
         APP.UI.eventEmitter.emit(UIEvents.AUDIO_MUTED, mute);
     },
+    /**
+     * Returns whether local audio is muted or not.
+     * @returns {boolean}
+     */
+    isLocalAudioMuted() {
+        return this.audioMuted;
+    },
     /**
      * Simulates toolbar button click for audio mute. Used by shortcuts and API.
      */

modules/keyboardshortcut/keyboardshortcut.js

                 $(":focus").is("input[type=password]") ||
                 $(":focus").is("textarea"))) {
                 if(e.which === "T".charCodeAt(0)) {
-                    APP.conference.muteAudio(true);
+                    if(APP.conference.isLocalAudioMuted())
+                        APP.conference.muteAudio(false);
                 }
             }
         };