fix: ensure organizationalUnit is converted before engine initialization

The migration was failing during upgrade to stable32 because it tried to
set organizationalUnit as a string when the property expects an array.

The issue occurred because addConfigPathToOpenSsl() (which calls getEngine()
and triggers populateInstance()) was executed before convertRootCertOuStringToArray().

This fix reorders the method calls in preSchemaChange() to convert the OU
value to an array before initializing the engine, preventing the TypeError.

Fixes the error:
TypeError: Cannot assign string to property
OCA\Libresign\Handler\CertificateEngine\AEngineHandler::$organizationalUnit
of type array

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

Author: vitormattos

lib/Migration/Version13000Date20251031165700.php

@@ -52,8 +52,8 @@ public function __construct(
 	 */
 	#[Override]
 	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
-		$this->addConfigPathToOpenSsl();
 		$this->convertRootCertOuStringToArray();
+		$this->addConfigPathToOpenSsl();
 		$this->backupCrlDataToDisk();
 	}