Need to default primary flag on work email type

Summary:

The requirement is that employee should not be able to make home email as primary but that option is not available for now.

https://community.oracle.com/customerconnect/discussion/541702/disable-the-primary-flag-to-other-emails-other-than-the-work-email

So, we have hidden the primary checkbox which got hidden from work email as well.

Content (required):

So, we need to default the primary flag on work email type.

Version (include the version you are using, if applicable): 22B

Code Snippet (add any code snippets that support your topic, if applicable):