[BUG][html2] HTML2-Generator not displaying query parameters properly

[kas1337]

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)

Description

html2 generator ignores "default" and "enum" field and the resulting url is missing a value for the query parameter.

openapi-generator version

5.1.0

OpenAPI declaration file content or url

 "servers" : [ {
    "url" : "https://my-cookies/"
  } ],
  "paths" : {
    "/api/v4/cookies/amount" : {
      "get" : {
        "summary" : "Summary",
        "description" : "Description",
        "operationId" : "get_amount",
        "parameters" : [{
          "name" : "color",
          "in" : "query",
          "description" : "Cookie color",
          "schema" : {
            "type" : "string",
            "default" : "red",
            "enum" : [ "red", "blue", "green", "yellow" ]
          }
        } ],

The entire json file and the resulting index.html file can be found here: https://gist.github.com/kas1337/7381b3764fdfe340e272958e5a9a19b8

Generation Details & Steps to reproduce

I've tested with the latest master branch as described here https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-to-test-with-the-latest-master-of-openapi-generator using the following command (Linux)

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g html2 -i openapi.json

Actual output

The resulting url in the generated documentation is missing the query parameter.

/api/v4/cookies/amount

In the CURL example the query parameter is visible but it looks like it's missing a value

curl -X GET\
 -H "Accept: application/pdf,application/json"\
 "https://my-cookies/api/v4/cookies/amount?color="

Furthermore, the "default" and "enum" fields are missing in the parameters section. Only the description is displayed.

Expected output

I would expect something like this for the url

/api/v4/cookies/amount?color={example_color}

as well as for the CURL example.

It would be nice if you could have a look into this. Thanks!