chore(migration): correct the date part of the layout migration

The date part still read 20260318, which predates the file itself: it was added
to the branch on 2026-05-11. Set it to the day the migration ships so the name
orders correctly against the other 2.4.0 migrations.

The class name is what gets recorded in oc_migrations, and it already changed
with the version prefix rename, so this carries no additional upgrade cost. The
step guards every change with hasTable()/hasColumn() and is a no-op where it has
already run.

Assisted-by: ClaudeCode:claude-opus-5
Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

Author: AndyScherzinger

…ration/Version2400Date20260318000000.php …ration/Version2400Date20260901000000.phplib/Migration/Version2400Date20260318000000.php renamed to lib/Migration/Version2400Date20260901000000.php lib/Migration/Version2400Date20260318000000.php renamed to lib/Migration/Version2400Date20260901000000.php

@@ -16,7 +16,7 @@
 use OCP\Migration\SimpleMigrationStep;
 use Override;
 
-class Version2400Date20260318000000 extends SimpleMigrationStep {
+class Version2400Date20260901000000 extends SimpleMigrationStep {
 
 	#[Override]
 	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {