css(buttons): remove specificity for ::-moz-focus-inner and :-moz-focusring

See necolas/normalize.css#847

Author: marella

modernize.css

@@ -192,10 +192,7 @@ button,
  * Remove the inner border and padding in Firefox.
  */
 
-button::-moz-focus-inner,
-[type='button']::-moz-focus-inner,
-[type='reset']::-moz-focus-inner,
-[type='submit']::-moz-focus-inner {
+::-moz-focus-inner {
   border-style: none;
   padding: 0;
 }
@@ -204,10 +201,7 @@ button::-moz-focus-inner,
  * Restore the focus styles unset by the previous rule.
  */
 
-button:-moz-focusring,
-[type='button']:-moz-focusring,
-[type='reset']:-moz-focusring,
-[type='submit']:-moz-focusring {
+:-moz-focusring {
   outline: 1px dotted ButtonText;
 }