Move Temasys-specific attach to its existing execution branch

modules/RTC/JitsiTrack.js

  */
 JitsiTrack.prototype.attach = function (container) {
     if(this.stream) {
-        // The container must be visible in order to play or attach the stream
-        // when Temasys plugin is in use
-        var containerSel = $(container);
-        if (RTCBrowserType.isTemasysPluginUsed() &&
-            !containerSel.is(':visible')) {
-            containerSel.show();
-        }
-        container
-            = RTCUtils.attachMediaStream(container, this.stream);
+        container = RTCUtils.attachMediaStream(container, this.stream);
     }
     this.containers.push(container);
 

modules/RTC/RTCUtils.js

                             return;
                         }
 
+                        // The container must be visible in order to play or
+                        // attach the stream when Temasys plugin is in use
+                        var containerSel = $(element);
+                        if (RTCBrowserType.isTemasysPluginUsed()
+                                && !containerSel.is(':visible')) {
+                            containerSel.show();
+                        }
                         var isVideoStream = !!stream.getVideoTracks().length;
                         if (isVideoStream && !$(element).is(':visible')) {
                             throw new Error('video element must be visible to attach video stream');