IE8-9 fix for issue 3674

Created by: stayce

Fix for this issue on IE 8, https://github.com/twitter/bootstrap/issues/3674

less/forms.less

@@ -133,7 +133,7 @@ input[type="color"],
 input[type="radio"],
 input[type="checkbox"] {
   margin: 4px 0;
-  *margin-top: 0; /* IE7 */
+  margin-top: 0\9; /* IE6-9 */
   line-height: normal;
   cursor: pointer;
 }