Administration: Remove duplicate font-face declaration in Dashicons CSS.

This was causing console warnings in some browsers.

Props aduth, joen, afercia, timph, ianbelanger.
Fixes #47183.
Built from https://develop.svn.wordpress.org/trunk@45310


git-svn-id: http://core.svn.wordpress.org/trunk@45121 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/dashicons.css

@@ -5,14 +5,6 @@
  */
 
 /* stylelint-disable function-url-quotes, declaration-colon-newline-after */
-
-@font-face {
-	font-family: dashicons;
-	src: url("../fonts/dashicons.eot?50db0456fde2a241f005968eede3f987");
-	font-weight: 400;
-	font-style: normal;
-}
-
 @font-face {
 	font-family: dashicons;
 	src: url("../fonts/dashicons.eot?50db0456fde2a241f005968eede3f987");