[BUG] for kotlin okhttp client ".value" is being added after paramName for default values of List<Enum> type

Description

Followup for #13243

It appears there is a bug in okhttp templates or some upstream code: ".value" is being added after paramName when isEnum set to true. This happens even if type of paramName being collection containing enum values. So I guess there has to be some combination of isEnum and isContainer conditionals. I'm not that proficient in mustache templating so I guess better I could do is to open a dedicated issue. For sake of this PR I've changed values in api spec from list of enums to list of strings.

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

openapi-generator version

6.0.1
commit https://github.com/OpenAPITools/openapi-generator/commit/2a007b3465e6bddadf2ecb04cf2fa11229a1ed4d

OpenAPI declaration file content or url

  /foo/bar:
    post:
      operationId: UpdateBar
      consumes:
        - multipart/form-data
      parameters:
        - name: values
          in: formData
          required: false
          type: array
          items:
            type: string
            enum: # note enum here
              - value1
              - value2
          default:
            - value1
    responses:
        "200":
          description: "Success."

Related issues/PRs

#13243

Inspect modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/api.mustache around line 192, then generate a Kotlin JVM OkHttp client from the provided OpenAPI formData example. Verify that a default List parameter is handled without appending ".value" to the collection parameter, while preserving enum handling for non-collection values.