Discord redirect url cannot contain capital letters

[supercrafter100]

Describe the issue

When the hostname of the site contains capital letters, the redirect url will as well. However, Discord automatically puts everything to lowercase when you enter a redirect url and says the redirect is invalid if you do still have capital letters in the redirect url you provide during the oauth2 flow

NamelessMC Version

Development version

To Reproduce

1. Have capital letters in the hostname configured in core/config.php
2. Enter the redirect url as specified in StaffCP in the Discord developer portal and configure the client ID (secret isn't really required here)
3. Try to connect Discord using Oauth2
4. You'll now see an invalid redirect uri error

Expected Behaviour

We should automatically put the redirect uri to lowercase whenever we display it to the end user, as well as putting it to lowercase when redirecting the user to Discord for the Oauth2 flow.

Screenshots

No response

Additional Information

No response