Make blog and media NSFW values display correctly and save correctly on blog edit

Summary

Steps to reproduce

1. Make an nsfw post
2. Go to its media URL
3. Observe no NSFW on the media page

Platform information

Cross-platform web.

What is the current bug behavior?

Mature attribute does not currently propegate from an activity post to the entity.

What is the expected correct behavior?

These should be on the NSFW system and go through the PropegateProperties class.

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)

/label ~"T - Bug" ~"S - Triage:new"