revert fix for bug #2931216

ChangeLog

@@ -58,7 +58,6 @@ $HeadURL: https://phpmyadmin.svn.sourceforge.net/svnroot/phpmyadmin/trunk/phpMyA
 - bug #2926613 [edit] Copy database shows errors when DB has foreign key
 
 3.2.6.0 (not yet released)
-- bug #2931216 [config] Relations settings not updated on config change 
 
 3.2.5.0 (2010-01-10)
 - patch #2903400 [bookmarks] Status of bookmark table, 

libraries/Config.class.php

@@ -311,7 +311,6 @@ class PMA_Config
           || $this->error_config_file
           || $this->error_config_default_file) {
             $this->settings = array();
-            unset($_SESSION['relation']);
             $this->load();
             $this->checkSystem();
         }