fix: stop all running darling servers on uninstall

[Lazerbeak12345]

closes #1579

[CuriousTommy]

The script is broken

Seeing if Darling is currently running
error: list of process IDs must follow -p

Usage:
 ps [options]

 Try 'ps --help <simple|list|output|threads|misc|all>'
  or 'ps --help <s|l|o|t|m|a>'
 for additional help text.

For more details see ps(1).
Darling currently running for , shutting it down...
sudo: unknown user darling
sudo: error initializing audit plugin sudoers_audit

[Lazerbeak12345]

Tested much more extensively this time.

I noticed that sometimes pgrep launchd doesn't work when pgrep -f launchd does. Not sure if I want to include arguments (and capture rare, but possible false positives).

[Lazerbeak12345]

The other thing: this script makes the assumption that a user can run sudo sudo -u other_user darling shutdown. Running sudo as the root user isn't possible by default on some systems (such as mine, which is actually using doas), but I'm pretty sure it's possible by default on fedora and ubuntu.

• I may want to do a Priv. check first instead of relying on sudo capabilities

[CuriousTommy]

LGTM. Once you combine your commits into one, I'll merge your changes.

[CuriousTommy]

Thank you for your contribution!