Remove nonce from WP set REST Endpoint

[razvanaldea89]

Describe the bug Remove the nonce from the WP set REST Endpoint and let it be handled by WP itself, as in certain situations may cause Bad Gateways ( https://github.com/WPChill/download-monitor/blob/master/src/Admin/Reports/class-dlm-reports.php#L167 ). Could not reproduce on my end but tested on client's and wiping out the nonce was the solution. ( https://support.wpchill.com/conversation/8504?folder_id=153 )

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Extensions installed and activated:

• [ ] Advanced Access Manager
• [ ] Amazon S3
• [ ] Buttons
• [ ] Captcha
• [ ] CSV Exporter
• [ ] CSV Importer
• [ ] Downloading Page
• [ ] Email lock
• [ ] Email Notifications
• [ ] Google Drive
• [ ] Gravity Forms
• [ ] Mailchimp
• [ ] Ninja Forms
• [ ] Page Addon
• [ ] Terms & Conditions
• [ ] Twitter Lock

Additional context Add any other context about the problem here.

[cristianraiber]

Looks good from the code