updated webgl template

Assets/WebGLTemplates/Better2020/index.html

@@ -67,7 +67,6 @@
 
       if (/iPhone|iPad|iPod|Android/i.test(navigator.userAgent)) {
         container.className = "unity-mobile";
-        config.devicePixelRatio = 1;
       }
 #if BACKGROUND_FILENAME
       canvas.style.background = "url('" + buildUrl + "/{{{ BACKGROUND_FILENAME.replace(/'/g, '%27') }}}') center / cover";
@@ -75,6 +74,7 @@
       loadingCover.style.display = "";
 
       const script = document.createElement("script");
+      var jsUnityInstance = null;
       script.src = loaderUrl;
       script.onload = () => {
         createUnityInstance(canvas, config, (progress) => {
@@ -82,6 +82,7 @@
           progressBarEmpty.style.display = "";
           progressBarFull.style.width = `${100 * progress}%`;
         }).then((unityInstance) => {
+          jsUnityInstance = unityInstance;
           loadingCover.style.display = "none";
           if (canFullscreen) {
             if (!hideFullScreenButton) {