dmcheck: Fix enabling ly (#85)

ly.service no longer exists and instead uses a template service. The
symlink matches the behaviour when running `systemctl enable
ly@tty2`

Signed-off-by: Eric Naim <dnaim@cachyos.org>

archiso/airootfs/usr/local/bin/dmcheck

@@ -17,7 +17,8 @@
 
 package=ly
 if pacman -Qs $package > /dev/null ; then
-  ln -sf /usr/lib/systemd/system/ly.service /etc/systemd/system/display-manager.service
+  rm -f /etc/systemd/system/getty.target.wants/getty@tty2.service
+  ln -sf /usr/lib/systemd/system/ly@.service /etc/systemd/system/multi-user.target.wants/ly@tty2.service
 fi
 package=plasma-login-manager
 if pacman -Qs $package > /dev/null ; then