fix: use correct regex to match PA code in URLs

public/typo3conf/ext/ep_track/Classes/Middleware/TrackingMiddleware.php

@@ -153,7 +153,7 @@ class TrackingMiddleware implements MiddlewareInterface
         $query = $params->getQueryString();
         $path = $params->getRequestUri();
 
-        if (!preg_match('/^\/PA\d{3,4}\/?$/i', $path)) {
+        if (!preg_match('/\/PA\d{3,4}\/?$/i', $path)) {
             return null;
         }