fix: use correct File parameter in loadCertDataFromLibreSignFile

Fix bug where $this->file was used instead of $file parameter,
causing validation to fail when checking signed node ID.

Signed-off-by: Vitor Mattos <[email protected]>

Author: vitormattos

lib/Service/FileService.php

@@ -316,7 +316,7 @@ private function loadFileMetadata(): void {
 	}
 
 	private function loadCertDataFromLibreSignFile(?File $file = null): void {
-		if (!empty($this->certData) || !$this->options->isValidateFile() || !$file instanceof File || !$this->file->getSignedNodeId()) {
+		if (!empty($this->certData) || !$this->options->isValidateFile() || !$file instanceof File || !$file->getSignedNodeId()) {
 			return;
 		}