On /admin/application_settings "Internal users" input isn't read-only

Summary

On /admin/application_settings/general under "Account and limit" the "Internal users" input is read-only. This is correct behavior. But if the path is /admin/application_settings (an alias for the same page), this input is not read-only. That's a bug. The corresponding chunk of JS is loaded only on /admin/application_settings/general, but not on /admin/application_settings.

Steps to reproduce

1. Go to Admin Area.
2. On the sidebar click on "Settings".
3. You're on /admin/application_settings page. Expand "Account and limit".
4. Uncheck "Newly registered users will by default be external" if it's checked.
5. Try to type some regex pattern in the "Internal users" input.

What is the current bug behavior?

The input isn't read-only.

What is the expected correct behavior?

The input should be read-only.

Relevant logs and/or screenshots

Possible fixes

This issue is a part of a more general issue: #43659 (closed).