utils.js: Recognize file inputs as focusable elements (pull #1470)

Change utils.js method for checking element focusability to return true for file inputs.

Co-authored-by: Martijn Cuppens <[email protected]>

Author: mcking65

examples/js/utils.js

@@ -76,7 +76,7 @@ aria.Utils.isFocusable = function (element) {
     case 'A':
       return !!element.href && element.rel != 'ignore';
     case 'INPUT':
-      return element.type != 'hidden' && element.type != 'file';
+      return element.type != 'hidden';
     case 'BUTTON':
     case 'SELECT':
     case 'TEXTAREA':