fixup! feat: add form locking mechanism

Signed-off-by: Christian Hartmann <chris-hartmann@gmx.de>

Author: Chartman123

lib/Controller/ApiController.php

@@ -179,7 +179,7 @@ public function newForm(?int $fromId = null): DataResponse {
 
 			$this->formMapper->insert($form);
 		} else {
-			$oldForm = $this->formsService->getFormIfAllowed($fromId);
+			$oldForm = $this->formsService->getFormIfAllowed($fromId, Constants::PERMISSION_EDIT);
 
 			// Read old form, (un)set new form specific data, extend title
 			$formData = $oldForm->read();