mvc: configdStream: remove ob_end_flush()

Our default PHP configuration already has output buffering set to 0,
and since there is no explicit buffering start, the ob_end_flush()
will throw two exceptions on development mode when streaming a log
file. We likely don't need this anymore so removing it here.

src/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php

@@ -180,7 +180,7 @@ class ApiControllerBase extends ControllerRoot
         foreach ($headers as $header) {
             header($header);
         }
-        ob_end_flush();
+
         fpassthru($response);
     }