Default value for query parameter not exported to code and doc

Description

openapi: 3.0.0
Default value for query parameter not exported to code and doc.

Swagger-codegen version

Current, available in https://app.swaggerhub.com

Swagger declaration file content or url

https://app.swaggerhub.com/apis/marikori/default_value_bug/1.0.0

Command line used for generation

Use swaggerhub UI to generate documentation - Export -> Documentation -> html2:

Use swaggerhub UI to generate code - Export -> Server Stub -> spring:

Steps to reproduce

1. Define default value for parameter in OAS - line 14 (dafault = 0 for par1) in https://app.swaggerhub.com/apis/marikori/default_value_bug/1.0.0
2. Export html2 documentation using codegen available in swaggerbub (see above).
3. Export Spring server code using codegen available in swaggerbub (see above).

Results:
2. Default value not defined in exported documentation.
3. Default value not define in exported code.

Related issues/PRs

Suggest a fix/enhancement

Start with the linked OpenAPI declaration and reproduce both exports in SwaggerHub: html2 documentation and the Spring server stub. Compare the generated outputs for the query parameter defined with a default value; the work is done when that default appears correctly in both exported documentation and code.