Merge pull request #375 from jitsi/fix-transport-replace

Fix broken 'transport-replace'

modules/xmpp/JingleSessionPC.js

             this.setOfferCycle(
                 originalOffer,
                 () => {
-                    // Set local description OK, now localSDP up to date
-                    this.sendTransportAccept(this.localSDP, success, failure);
+                    const localSDP
+                        = new SDP(this.peerconnection.localDescription.sdp);
+                    this.sendTransportAccept(localSDP, success, failure);
                 },
                 failure);
         },