FS-7509: add -screen to current ext when pressing the share button

html5/verto/video_demo/verto.js

@@ -557,9 +557,9 @@ function doshare(on) {
     console.log("Attempting Screen Capture....");
     getScreenId(function (error, sourceId, screen_constraints) {
 	share_call = verto.newCall({
-            destination_number: $("#ext").val(),
+            destination_number: $("#ext").val() + "-screen",
             caller_id_name: $("#name").val() + " (Screen)",
-            caller_id_number: "screen",
+            caller_id_number: $("#cid").val() + " (screen)",
 	    videoParams: screen_constraints.video.mandatory,
             useVideo: true,
 	    screenShare: true