fix case error in leaveGame

static/script.js

@@ -481,7 +481,8 @@ window.addEventListener("DOMContentLoaded", function() {
                 this.ws.send(JSON.stringify(obj));
             }
         }
-        _leavegame() {
+        _leaveGame() {
+            console.log('leave button was clicked');
             this.ws.close();
         }