[mirotalksfu] - add pin/unpin also for sharing video/audio

public/css/Room.css

@@ -809,9 +809,10 @@ progress {
 }
 
 /*--------------------------------------------------------------
-# Video exit btn
+# Video exit, pin/Unpin btn
 --------------------------------------------------------------*/
 
+#__pinUnpin,
 #__videoExit {
     font-size: 1.5rem;
 }