[Sprint/VacantViper](fix): Update max video length on authorization #2365

Summary

Closes front#2365, Depends on front!705 (closed)

The issue right now, on production, if you log in as a pro user, your max_video_length does not refresh until an update.

Steps

1. Open dev tools
2. In the console, type window.Minds.max_video_length
3. Log into a pro account
4. Repeat step 2, it should have changed
5. Refresh and repeat again, it should stick.

Try logging into other users and experiment.

Regression Scope

Worst case, maybe the config value isn't found, and it defaults to 0. Test upload length to make sure it works.