Merge pull request SimpleMachines#9045 from sbulen/21_moz_depr_fix

[2.1] Remove deprecated moz feature

Author: jdarwood007

Themes/default/css/index.css

@@ -75,10 +75,6 @@ input[type="file"] {
 	padding: 2px;
 	height: auto;
 }
-/* Remove default mozilla dotted borders */
-input[type="submit"]::-moz-focus-inner, button::-moz-focus-inner {
-	border: 0;
-}
 /* Prevent inputs and images overflowing */
 img, input, select, textarea {
 	max-width: 100%;