fix(multi-stream) use highest video quality for screenshare

react/features/video-quality/subscriber.js

             }
         }
 
+        if (remoteScreenShares?.length) {
+            remoteScreenShares.forEach(sourceName => {
+                receiverConstraints.constraints[sourceName] = { 'maxHeight': VIDEO_QUALITY_LEVELS.ULTRA };
+            });
+        }
+
     } else {
         receiverConstraints = {
             constraints: {},