Add scu-* aliases for 'systemctl --user' commands (#6661)

plugins/systemd/systemd.plugin.zsh

@@ -10,7 +10,13 @@ sudo_commands=(
 
 for c in $user_commands; do; alias sc-$c="systemctl $c"; done
 for c in $sudo_commands; do; alias sc-$c="sudo systemctl $c"; done
+for c in $user_commands; do; alias scu-$c="systemctl --user $c"; done
+for c in $sudo_commands; do; alias scu-$c="systemctl --user $c"; done
 
 alias sc-enable-now="sc-enable --now"
 alias sc-disable-now="sc-disable --now"
 alias sc-mask-now="sc-mask --now"
+
+alias scu-enable-now="scu-enable --now"
+alias scu-disable-now="scu-disable --now"
+alias scu-mask-now="scu-mask --now"