Fix send email query

[sarayourfriend]

Fixes

Related to #3742 by @sarayourfriend

Description

See #2037 (comment) for a description of the problem needing solving in this PR.

I've marked this as critical because we need to get this email sent as soon as possible, which means we need to deploy this to production ASAP so we can run the command there.

Testing Instructions

Confirm your understanding of the problem as described in the linked comment, then check whether the modified query would solve the issue. For clarity, I have run the query in production as follows:

select count(distinct email) from api_oauth2registration where 'name' in (select 'name' 
 from api_throttledapplication where verified = true);

This returns 1628 rather than the 2 that the original query returned.

Checklist

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  for the catalog or just api/generate-docs for the API) where applicable.

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[obulat]

The code changes make sense and work as expected.

[obulat]

Suggested change

	# Only create the application if creating, and either
	# Only create the application if creating ??, and either

If creating ThrottledApplication ?

[sarayourfriend]

If creating the registration. create refers to the factory's state: https://factoryboy.readthedocs.io/en/stable/reference.html#postgeneration

create is a boolean indicating which strategy was used