fix: use correct Nextcloud instanceid in PKI path initialization

The initializePkiConfigPath method was using a variable named
'instanceId' from getSystemValue('instanceid') which could be confused
with LibreSign's instance_id. Changed to 'systemInstanceId' for clarity
and consistency with getConfigPathByParams method.

This ensures the PKI directories are created in the correct appdata path
using Nextcloud's system instance ID, while the directory name itself
contains LibreSign's CA identifier with its own instance ID.

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

Author: vitormattos

lib/Handler/CertificateEngine/AEngineHandler.php

@@ -363,8 +363,8 @@ private function initializePkiConfigPath(): string {
 		}
 		$pkiDirName = $this->caIdentifierService->generatePkiDirectoryName($caId);
 		$dataDir = $this->config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data/');
-		$instanceId = $this->config->getSystemValue('instanceid');
-		$pkiPath = $dataDir . '/appdata_' . $instanceId . '/libresign/' . $pkiDirName;
+		$systemInstanceId = $this->config->getSystemValue('instanceid');
+		$pkiPath = $dataDir . '/appdata_' . $systemInstanceId . '/libresign/' . $pkiDirName;
 
 		if (!is_dir($pkiPath)) {
 			$this->createDirectoryWithCorrectOwnership($pkiPath);