Users: Don't show the 'Add Existing User' form on the 'Add New User' screen to users without the promote_users capability.

Props bseddon, Mista-Flo

Fixes #37836

Built from https://develop.svn.wordpress.org/trunk@41122


git-svn-id: http://core.svn.wordpress.org/trunk@40962 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/user-new.php

@@ -310,7 +310,7 @@ if ( ! empty( $messages ) ) {
 <div id="ajax-response"></div>
 
 <?php
-if ( is_multisite() ) {
+if ( is_multisite() && current_user_can( 'promote_users' ) ) {
 	if ( $do_both )
 		echo '<h2 id="add-existing-user">' . __( 'Add Existing User' ) . '</h2>';
 	if ( ! current_user_can( 'manage_network_users' ) ) {