Multisite: Replace `is_super_admin()` with `manage_network_users` when trying to change the role of oneself.

Props abhishek kaushik.
Fixes #39204. See #37616.

Built from https://develop.svn.wordpress.org/trunk@39943


git-svn-id: http://core.svn.wordpress.org/trunk@39880 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/users.php

@@ -122,7 +122,7 @@ case 'promote':
 			wp_die(__('Sorry, you are not allowed to edit this user.'));
 		// The new role of the current user must also have the promote_users cap or be a multisite super admin
 		if ( $id == $current_user->ID && ! $wp_roles->role_objects[ $role ]->has_cap('promote_users')
-			&& ! ( is_multisite() && is_super_admin() ) ) {
+			&& ! ( is_multisite() && current_user_can( 'manage_network_users' ) ) ) {
 				$update = 'err_admin_role';
 				continue;
 		}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39942';
+$wp_version = '4.8-alpha-39943';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.