start the php session before loading plugins in a standard manner (related to bug 2835: )

git-svn-id: http://piwigo.org/svn/trunk@20599 68402e56-0260-453c-a942-63ccdbb3a9ee

include/user.inc.php

@@ -26,10 +26,6 @@ $user['id'] = $conf['guest_id'];
 
 if (isset($_COOKIE[session_name()]))
 {
-  if (session_id() == '')
-  {
-    session_start();
-  }
   if (isset($_GET['act']) and $_GET['act'] == 'logout')
   { // logout
     logout_user();
@@ -47,11 +43,6 @@ if ( $user['id']==$conf['guest_id'] )
   auto_login();
 }
 
-if (session_id()=="")
-{
-  session_start();
-}
-
 // using Apache authentication override the above user search
 if ($conf['apache_authentication'])
 {