Always trust this link check in "External link warning" does nothing

Summary

Whenever you click on an external link, like in Discord it comes up with a popup warning you that you're leaving Fluxer for an external website. There is a check that you can click that's supposed to make it so the popup doesn't come up for that domain (i.e github.com, wikipedia.org), however instead it doesn't do anything at the moment regardless of how many times you click it.

Steps to reproduce

1. Click on any external link
2. Click on the checkbox that says "Always trust x"
3. Once the link opens in your browser, go back to Fluxer
4. Click the link again and notice that the same popup comes up again despite clicking the checkbox.