Set the global $_cur current user so that preferences are loaded.

Thanks singpolyma

http://laconi.ca/trac/ticket/1573

scripts/xmppdaemon.php

@@ -175,6 +175,10 @@ class XMPPDaemon extends Daemon
 
         $user = $this->get_user($from);
 
+        // For common_current_user to work
+        global $_cur;
+        $_cur = $user;
+
         if (!$user) {
             $this->from_site($from, 'Unknown user; go to ' .
                              common_local_url('imsettings') .
@@ -211,6 +215,7 @@ class XMPPDaemon extends Daemon
 
         $user->free();
         unset($user);
+        unset($_cur);
 
         unset($pl['xml']);
         $pl['xml'] = null;