refactor: resolve comment

Author: Sakilmostak

crates/api_models/src/payments.rs

@@ -7656,7 +7656,7 @@ pub struct ResponsePaymentMethodTypesForPayments {
 
     /// Required fields for the payment_method_type.
     /// This is the union of all the required fields for the payment method type enabled in all the connectors.
-    #[schema(value_type = Option<RequiredFieldInfo>)]
+    #[schema(value_type = RequiredFieldInfo)]
     pub required_fields: Vec<payment_methods::RequiredFieldInfo>,
 
     /// surcharge details for this payment method type if exists