fix reference to PersistPostfachNachrichtByCommandServiceTest

vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/command/PersistPostfachNachrichtByCommandServiceTest.java

@@ -188,9 +188,10 @@ class PersistPostfachNachrichtByCommandServiceTest {
 
 		@Test
 		void shouldThrowException() {
-			assertThatThrownBy(() -> service.findAnswers(serviceKontoType, PostfachAddressTestFactory.STRING_BASED_IDENTIFIER_POSTFACH_ID_VALUE,
-					GrpcPostfachMailTestFactory.REFERENCED_NACHRICHT_ID))
-					.isInstanceOf(UnsupportedOperationException.class);
+			assertThatThrownBy(
+					() -> service.findAnswers(serviceKontoType, PostfachAddressTestFactory.IDENTIFIER.toString(),
+							GrpcPostfachMailTestFactory.REFERENCED_NACHRICHT_ID))
+									.isInstanceOf(UnsupportedOperationException.class);
 		}
 	}
 }