ErrorController: Set $this->rerenderLayout in init()

Solves the issue that when being redirected directly after login
or any other route which causes the layout being rerendered, we
are only presented with the inline layout of the error controller.

application/controllers/ErrorController.php

@@ -24,6 +24,14 @@ class ErrorController extends ActionController
      */
     protected $requiresAuthentication = false;
 
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->rerenderLayout = $this->params->has('renderLayout');
+    }
+
     /**
      * Display exception
      */