[fix] : rename old name of compositor command to new

Author: watasuke102

channels/i3/airootfs.any/etc/skel/.config/i3/config

@@ -35,7 +35,7 @@ exec_always --no-startup-id light-locker
 exec --no-startup-id xfce4-clipman
 exec --no-startup-id dex -ae i3
 exec --no-startup-id nm-applet
-exec --no-startup-id compton
+exec --no-startup-id picom
 exec --no-startup-id conky
 exec --no-startup-id fcitx