fix: avoid invalid filename

src/Controller/Teamer/Disposition/InvoicePdfController.php

@@ -34,7 +34,7 @@ class InvoicePdfController extends AbstractController
         $assignment = $disposition->getAssignment();
         $destination = $slugger->slug($assignment->getDestination());
 
-        $filename = sprintf('Honorarnote_%s_%s.pdf', $teamerPart, $disposition->getAssignment()->getDestination());
+        $filename = sprintf('Honorarnote_%s_%s.pdf', $teamerPart, $destination);
         $contentDisposition = HeaderUtils::makeDisposition(
             HeaderUtils::DISPOSITION_ATTACHMENT,
             $filename,