Fix a missing departure signal tagging combination

Author: hiddewie

signals.mss

@@ -1341,7 +1341,8 @@ Format details:
   /* NL departure light signals */
   /******************************/
   ["feature"="NL"]["departure_form"="light"],
-  ["feature"="NL:VL"]["departure_form"="light"] {
+  ["feature"="NL:VL"]["departure_form"="light"],
+  ["feature"="NL:VL"]["departure_form"="NL:light"] {
     ::text {
       text-name: [ref];
       text-dy: 12;