Developer Portal: Default value for parameters not shown

[nweseloh]

Bug description

When a default value is specified for an operation, the default is not shown in the developer portal.

Reproduction steps

1. Import an OpenAPI definition like this (abbreviated):

 /countries:
    get:
      operationId: get-countries
      parameters:
        - name: displayLanguage
          in: query
          description: Please provide a two letter language code to set the language for the display name.
          schema:
            type: string
            default: EN
          example: EN

2. Go to the developer portal and select the operation
3. The 'default' value is not shown (only the 'example') value:
   

Expected behavior

The 'default' value should be shown, similar to the example value, like this:

Is your portal managed or self-hosted?

Managed