test: fix API tests to use internal file ID instead of nodeId

Update test methods to pass internal LibreSign file ID via getId()
instead of Nextcloud nodeId. API endpoints expect the internal ID,
not the filesystem node ID.

Fixes:
- NotifyControllerTest::testNotifySignersWithSuccess
- SignFileControllerTest::testDeleteSignFileIdSignRequestIdWithSuccess
- SignFileControllerTest::testDeleteUsingSignFileIdWithSuccess

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/php/Api/Controller/NotifyControllerTest.php

@@ -67,7 +67,7 @@ public function testNotifySignersWithSuccess():void {
 				'Content-Type' => 'application/json'
 			])
 			->withRequestBody([
-				'fileId' => $file->getNodeId(),
+				'fileId' => $file->getId(),
 				'signers' => [
 					[
 						'email' => 'person@test.coop'

tests/php/Api/Controller/SignFileControllerTest.php

@@ -279,7 +279,7 @@ public function testDeleteSignFileIdSignRequestIdWithSuccess():void {
 			->withRequestHeader([
 				'Authorization' => 'Basic ' . base64_encode('allowrequestsign:password')
 			])
-			->withPath('/api/v1/sign/file_id/' . $file->getNodeId() . '/' . $signers[0]->getId());
+			->withPath('/api/v1/sign/file_id/' . $file->getId() . '/' . $signers[0]->getId());
 
 		$this->assertRequest();
 	}
@@ -326,7 +326,7 @@ public function testDeleteUsingSignFileIdWithSuccess():void {
 			->withRequestHeader([
 				'Authorization' => 'Basic ' . base64_encode('allowrequestsign:password')
 			])
-			->withPath('/api/v1/sign/file_id/' . $file->getNodeId());
+			->withPath('/api/v1/sign/file_id/' . $file->getId());
 
 		$this->assertRequest();
 	}