Removed unused cleaveOptions and set unchecked as default for newsletter sign up in registration form.

Closes no issue

What does this MR do?

Removed unused cleaveOptions and set unchecked as default for newsletter sign up in registration form.

How confident are you it won't break things if deployed?

test is passed

Links to related issues

https://yunity.slack.com/archives/C1T1ZM9A4/p1589209325264100

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))
• Once your MR has been merged, you are responsible to update the #foodsharing-beta Slack channel about what has been changed here. They will test your work in different browsers, roles or other settings