Fix ImageController filename

Author: clem

src/Controller/ImageController.php

@@ -35,7 +35,7 @@ public function thumbnail(Request $request, string $paramString, string $filenam
         }
 
         try {
-            $filename = PathCanonicalize::canonicalize($this->getPath($request), $filename);
+            PathCanonicalize::canonicalize($this->getPath($request), $filename);
         } catch (Exception) {
             return $this->sendErrorImage();
         }