FS-11470: WebRTC Unified plan not properly supported

Chrome is beginning to default their SDP semantics to the WebRTC standard
'Unified Plan', and Verto does not currently construct its SDP according
to this standard. For now, force the browser to use 'Plan B' semantics.

html5/verto/js/src/jquery.FSRTC.js

@@ -715,6 +715,7 @@
         }
 
 	config.bundlePolicy = "max-compat";
+	config.sdpSemantics = "plan-b";
 
         var peer = new window.RTCPeerConnection(config);