fix(systemd): enable `--user` on restart command (#10543)

`restart` is a unit-related command, not power-related, so it should appear as `sc-restart=sudo systemctl restart` and `scu-restart=systemctl --user restart`

plugins/systemd/systemd.plugin.zsh

@@ -45,6 +45,7 @@ sudo_commands=(
   reload-or-restart
   reset-failed
   rescue
+  restart
   revert
   set-default
   set-environment
@@ -63,7 +64,6 @@ power_commands=(
   hybrid-sleep
   poweroff
   reboot
-  restart
   suspend
 )