Only default x-example values used in curl call

Q&A (please complete the following information)

• OS: Win
• Browser: Mozilla, Chrome
• Version: Mozilla: 71.0, Chrome: 78.0
• Method of installation: yarn
• Swagger-UI version: swagger-ui/swagger-ui-react: ^3.24.3
• Swagger/OpenAPI version: Swagger 2.0

Content & configuration

Example Swagger/OpenAPI definition:
Json swagger as several parameters with a x-example property set, which is used as the default values in the curl call, which is the main issue here

"parameters": {
    "requestId": {
      ...
      "x-example": "123ABC"
    },

Swagger-UI configuration options:

return <SwaggerUI spec={swaggerJson} />

Describe the bug you're encountering

When I try out our get paths with manually entered parameter values, it will still use the default "x-example"-values defined in the swagger doc.

To reproduce...

Steps to reproduce the behavior:

1. Go to any get path
2. Click on Try it out
3. Scroll down to parameters, remove default values, fill in your own values
4. Click Execute
5. Curl will make the call, but will use the default x-example values for the query string parameters

Expected behavior

Expect the entered values to be the ones that curl will use as parameters

Reproduce the issue through the SwaggerUI spec configuration: open a GET path, use Try it out, replace or remove the x-example values, and execute the request. Trace the request-generation entry point used by curl and verify that the submitted parameter values, rather than the documented defaults, are used; done means the generated curl command and call contain the entered values.