Update gfyObject.js

Possible fix for muted

Author: agerauer

js/gfyObject.js

@@ -149,7 +149,7 @@ var gfyObject = function (gfyElem, gfyIndex) {
             vid.controls = false;
         vid.style.width = '100%';
         vid.style.height = 'auto';
-        vid.setAttribute('muted', 'muted');
+        vid.muted = 'muted';
         // poster url gfyName is case sensitive
         vid.setAttribute('poster', 'https://thumbs.gfycat.com/' + gfyItem.gfyName + '-poster.jpg');
         source2 = document.createElement('source');