Multisite: Fix copy/paste issue in id attribute for a dismissible message on Sites screen.

Props imath.
Fixes #37764.
Built from https://develop.svn.wordpress.org/trunk@38305


git-svn-id: http://core.svn.wordpress.org/trunk@38246 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/sites.php

@@ -273,7 +273,7 @@ if ( isset( $_GET['updated'] ) ) {
 	}
 
 	if ( ! empty( $msg ) )
-		$msg = '<div class="updated" id="message notice is-dismissible"><p>' . $msg . '</p></div>';
+		$msg = '<div id="message" class="updated notice is-dismissible"><p>' . $msg . '</p></div>';
 }
 
 $wp_list_table->prepare_items();