IE deselect exception fix.

IE11 with the developer tools open would still throw an exception on this line of code, so remove it as it is also executed and caught in the setTimeout.

core/blockly.js

@@ -537,7 +537,6 @@ Blockly.removeAllRanges = function() {
   if (window.getSelection) {  // W3
     var sel = window.getSelection();
     if (sel && sel.removeAllRanges) {
-      sel.removeAllRanges();
       setTimeout(function() {
           try {
             window.getSelection().removeAllRanges();