Update for 1.5

[agabellini]

Hello,

this plugin does not work anymore with version 1.5 of Roundcube, see roundcube/roundcubemail#7860

This is a little patch. I don't know how to check the version of roundcube, otherwise you could use an 'if' to handle different versions.

--- dovecot_ident.php.orig	2021-07-05 10:31:19.104942320 +0200
+++ dovecot_ident.php	2021-07-05 10:20:20.425873102 +0200
@@ -17,7 +17,7 @@

   function add_ident($args)
   {
-    $args['ident'] = $args['ident'] ? array_merge($args['ident'], array('x-originating-ip' => $_SERVER['REMOTE_ADDR']))
+    $args['preauth_ident'] = $args['preauth_ident'] ? array_merge($args['preauth_ident'], array('x-originating-ip' => $_SERVER['REMOTE_ADDR']))
 									: array('x-originating-ip' => $_SERVER['REMOTE_ADDR']);
     return $args;
   }