refactor: OrganisationController::activate — restore if/else expressiveness

The previous diff replaced the original `if (PROVISIONING) { … } else
{ … }` with two independent `if` statements branching on the same
$status read. Behaviour is equivalent today (the two conditions are
mutually exclusive), but a future refactor that mutates `$status`
between the branches would silently double-run, and a reader can't
tell at a glance that exactly one branch fires.

Fold the second `if` back into the `else`.

Refs: #1419 review (minor) — discussion_r3187494527

Author: rubenvdlinde

lib/Controller/OrganisationController.php

@@ -1169,9 +1169,7 @@ public function activate(string $uuid): JSONResponse
             if ($status === TenantLifecycleService::STATUS_PROVISIONING) {
                 $userId = \OC::$server->get(\OCP\IUserSession::class)->getUser()?->getUID() ?? 'admin';
                 $result = $this->tenantLifecycleService->provision($organisation, $userId);
-            }
-
-            if ($status !== TenantLifecycleService::STATUS_PROVISIONING) {
+            } else {
                 $result = $this->tenantLifecycleService->reactivate($organisation);
             }