Merge pull request #109 from mattkatz/fix-systemd-control-group

For systemd, migrate from killmode=none to control-group

Author: bruno-

scripts/handle_tmux_automatic_start/systemd_enable.sh

@@ -28,7 +28,7 @@ template() {
 
 	ExecStop=${resurrect_save_script_path}
 	ExecStop=${tmux_path} kill-server
-	KillMode=none
+	KillMode=control-group
 
 	RestartSec=2