Heretic: Check rlightlevel instead of llightlevel for rejecting empty…

… lines and triggers

src/heretic/r_bsp.c

@@ -313,7 +313,7 @@ void R_AddLine(seg_t * line)
 // reject empty lines used for triggers and special events
     if (backsector->ceilingpic == frontsector->ceilingpic
         && backsector->floorpic == frontsector->floorpic
-        && backsector->lightlevel == frontsector->lightlevel
+        && backsector->rlightlevel == frontsector->rlightlevel
         && backsector->special == frontsector->special // [crispy] check for special as well
         && curline->sidedef->midtexture == 0)
         return;