"Update OpenAPI Connected Service" doesn't use previous connection settings

[musukvl]

"Update OpenAPI Connected Service" form populated with
https://petstore.swagger.io/v2/swagger.json
instead of previously entered swagger.json file URL

I think, better to use settings from nswag file:
"swaggerGenerator" => "fromSwagger" => "url"

[dmitry-pavlov]

Noted @musukvl