refactor: this commit updates syntax to a more modern version without the use of brackets

Author: https-richardy

Boundaries/Comanda.Payments/Source/Comanda.Payments.WebApi/Controllers/PaymentsController.cs

@@ -48,9 +48,7 @@ public async Task<IActionResult> CreateCheckoutSessionAsync(
         // if it is not present, a 400 response is returned
 
         if (string.IsNullOrWhiteSpace(credential))
-        {
             return StatusCode(StatusCodes.Status400BadRequest, PaymentErrors.CredentialNotProvided);
-        }
 
         var result = await dispatcher.DispatchAsync(request, cancellation);