Use selfBrowserSurface in demo

Author: eladalon1983

identity/demos/self_capture_detection/index.html

@@ -179,7 +179,7 @@ <h3>Demo operation:</h3>
 
         let stream;
         try {
-          stream = await navigator.mediaDevices.getDisplayMedia();
+          stream = await navigator.mediaDevices.getDisplayMedia({selfBrowserSurface: "include"});
         } catch (error) {
           update();
           return;