directly execute i3

templates/i3/i3wm.service.j2

@@ -3,7 +3,7 @@ Description=i3 Window Manager
 PartOf=graphical-session.target
 
 [Service]
-ExecStart=/usr/bin/i3
+ExecStart=i3
 ExecStopPost=/bin/systemctl --user stop graphical-session.target
 Restart=on-failure