set the correct "marked an NSFW" when loading admin-user

What does this PR do?

Before this change, the moderation page for a user always showed the "Mark all media from user as NSFW" toggle as being off, regardless of the actual value in the database.

With this, it shows the correct value. Thanks @Amelia for reporting the problem.

Contribution Guidelines By submitting this merge request, you agree to follow our Contribution Guidelines

• I agree to follow this project's Contribution Guidelines
• I have made sure to test this pull request