fe editing: update expected param value (bis)

ot_optimizer/Classes/Middleware/Frontend/OtPageResolver.php

@@ -60,7 +60,7 @@ class OtPageResolver extends \TYPO3\CMS\Frontend\Middleware\PageResolver
         // a backend user shall be authenticated for this
         $requestedFromBE = (
                 preg_match("/.+\/typo3\/index.php\?route=.*(Viewpage)|(FrontendEditing).*/", $_SERVER['HTTP_REFERER']) ||
-                $request->getQueryParams()['frontend_editing'] === true
+                $request->getQueryParams()['frontend_editing'] === 'true'
             )
             && $GLOBALS['BE_USER'];