Fix fips-counter in touch-demo.sky

sky/examples/touch-demo.sky

 <sky>
 <import src="fps-counter.sky" />
 <style>
 dot {
     position: absolute;
     height: 100px;
     width: 100px;
     background-color: #00FF00;
 }
 </style>
 <dot />
 <log>Ready</log>
-<x-fps-counter />
+<fps-counter />
 <script>
 var dot = document.querySelector("dot");
 var log = document.querySelector("log");
 
 function logTouchEvent(evt) {
   var message = "type=" + event.type;
   if (evt.touches && evt.touches.length > 0) {
     var x = evt.touches[0].clientX.toFixed(2);
     var y = evt.touches[0].clientY.toFixed(2);
     message += " x=" + x + " y=" + y;
 
     var transform = "translate(" + (x - 50)  + "px," + (y - 50) + "px)";
     dot.style.transform = transform;
   }
   log.textContent = message;
 }
 
 document.documentElement.addEventListener("touchstart", logTouchEvent);
 document.documentElement.addEventListener("touchmove", logTouchEvent);
 document.documentElement.addEventListener("touchend", logTouchEvent);
 document.documentElement.addEventListener("touchcancel", logTouchEvent);
 </script>
 </sky>