Navigation: Remove current-item exception for download page

This was meant to prevent the current menu item styles from applying to the download button, but the CSS already handles that. Instead, this exception was just preventing the style on the menu item itself.

Fix #358

mu-plugins/blocks/global-header-footer/blocks.php

@@ -945,11 +945,6 @@ function is_wporg_network() {
 function set_current_item_class( $menu_items ) {
 	$current_url = get_menu_url_for_current_page( $menu_items );
 
-	// The download menu item is a button, we don't highlight it
-	if ( get_download_url() === $current_url ) {
-		return $menu_items;
-	}
-
 	foreach ( $menu_items as & $item ) {
 		$sub = false;
 		if ( ! empty( $item['submenu'] ) ) {