x11/nwg-menu: unbreak reboot/poweroff buttons

env vars: []; command: 'systemctl'; args: [-i poweroff]

x11/nwg-menu/Makefile

 PORTNAME=	nwg-menu
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.1.1
+PORTREVISION=	1
 CATEGORIES=	x11
 
 MAINTAINER=	jbeich@FreeBSD.org

x11/nwg-menu/files/patch-main.go

+- Adapt to BSD-style shutdown
+
+--- main.go.orig	2021-06-19 23:37:36 UTC
++++ main.go
+@@ -119,8 +119,8 @@ var fileManager = flag.String("fm", "thunar", "File Ma
+ var term = flag.String("term", "alacritty", "Terminal emulator")
+ var cmdLock = flag.String("cmd-lock", "swaylock -f -c 000000", "screen lock command")
+ var cmdLogout = flag.String("cmd-logout", "swaymsg exit", "logout command")
+-var cmdRestart = flag.String("cmd-restart", "systemctl reboot", "reboot command")
+-var cmdShutdown = flag.String("cmd-shutdown", "systemctl -i poweroff", "shutdown command")
++var cmdRestart = flag.String("cmd-restart", "shutdown -r now", "reboot command")
++var cmdShutdown = flag.String("cmd-shutdown", "shutdown -p now", "shutdown command")
+ 
+ func main() {
+ 	timeStart := time.Now()