Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output? Use the correct formData body inserter.

Description

At the moment when a body inserter is selected to use on webclient, url encoded is wrongly using multi part body inserter. It should not.

openapi-generator version

4.0.0 latest master version.

Suggest a fix

Use BodyInserters.fromFormData for url encoded and BodyInserters.fromMultipartData for multipart.