Merge pull request #563 from tatankat/fix_switchback

Use same parameters in Set-Cookie for deletion as for creation, other…

core/framework/Response.php

@@ -562,7 +562,7 @@ public function setSessionCookie($key, $value)
          */
         public function deleteCookie($key)
         {
-            setcookie($key, '', NOW - 36000, (Context::getWebroot() != '/') ? Context::getWebroot() : '');
+            $this->setCookie($key, '', NOW - 36000);
             return true;
         }