Fix cursor style for disabled button input

The Android 4.0.* work around - `html input[type="button"]` - requires
the addition of `html` to the selector for disabled inputs, otherwise
disabled button inputs still have the `pointer` cursor.

Author: necolas

normalize.css

@@ -427,7 +427,7 @@ input[type="submit"] {
  */
 
 button[disabled],
-input[disabled] {
+html input[disabled] {
     cursor: default;
 }