Fix change type of Show optional parameters button

[tuanpt-0634]

Description

Fix #798

Motivation and Context

The button Show optional parameters is in a form, so it's type is default to submit
.

Since, we don't want to submit form in this case, we need to change button type to button.

How Has This Been Tested?

Tested on local env

Screenshots (if appropriate)

To reproduce

docusaurus-openapi-submit-bug-win.mp4

This can be reproduced on https://docusaurus-openapi.tryingpan.dev/cos/list-buckets

After fixed

docusaurus-openapi-submit-bug-fixed-win.mp4

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[sserrata]

Thanks for the contribution @tuanpt-0634! Sometimes one line of code can make all the difference. 🥇

[github-actions]

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