New comment by LinArcX on void-packages repository

https://github.com/void-linux/void-packages/pull/20599#issuecomment-611489144

Comment:
If i try to unlock, i'll get this error:

> (io.elementary.switchboard:21004): Gtk-WARNING **: 16:23:18.968: Error acquiring permission: Failed to acquire permission for action-id io.elementary.switchboard.power.administration

<img src="https://gist.githubusercontent.com/LinArcX/c8e9bc4eec041116639293abb011a9b0/raw/43107edc6c4615d4d568e12f517a6a1e122e4a24/Screenshot%2520from%25202020-04-09%252016-24-33.png"></img>

~~So we need to add pantheon-agent-polkit as runtime dependency of this package. Also [pantheon-session](https://github.com/void-linux/void-packages/pull/20538) also needs to update also. I'm going to upadte both of them.~~

I think it's a better idea to add `pantheon-agent-polkit` as runtime dependency of [pantheon-session](https://github.com/void-linux/void-packages/pull/20538). Since [switchboard-plug-user-accounts](https://github.com/void-linux/void-packages/pull/20617) also needs it.

Also i'm going to add it here:
`/usr/share/gnome-session/sessions/pantheon.session`