Provide dual screen setup where needed.

For SDDM, the projector is switched off: dual_screen[0].
For Wayland, dual_screen[1] is set as primary screen.

roles/lmn_fvs/templates/lmn-fix-screen.j2

@@ -0,0 +1,10 @@
+#!/usr/bin/bash
+#
+# Set the primary screen after login
+#
+set -eu
+
+sleep 5
+if [[ "$XDG_SESSION_TYPE" = wayland ]] ; then
+    kscreen-doctor output.{{ dual_screen[1] }}.priority.1
+fi