Power settings ignored by login screen

## What Happened
I disabled suspend on inactivity on my Nuc, it is always plugged in of course, but it still suspends either when I'm not logged in or even when the display is locked.

## Expected Behavior
The system should not suspend

## Steps to Reproduce

1. install elementary
2. Set the power settings to never suspend with the admin account
3. log out or reboot
4. Wait 15 minutes, the system suspends

Note that the workarround I used on elementary 5 on the CLI as the lightdm user still works

## Platform Information
Elementary 6.0 beta updated to the latest release 2021-06-02