Remove dead code

Author: niklasvh

dist/html2canvas.js

@@ -2810,7 +2810,6 @@ function createProxyUrl(proxyUrl, src, callback) {
 }
 
 function ProxyImageContainer(src, proxy) {
-    var script = document.createElement("script");
     var link = document.createElement("a");
     link.href = src;
     src = link.href;