TSG S06b: fix trapdoor appearing on top of units

Author: Dalas121

data/campaigns/The_South_Guard/scenarios/06b_The_Tides_of_War.cfg

@@ -160,7 +160,8 @@
         {BRAZIER_ILLUMINATION 17 13}
         {PLACE_IMAGE scenery/stairway.png 22 7}
         [item]
-            x,y,halo=22,7,"scenery/trapdoor-centered.png~FL()"
+            x,y=22,7
+            image="scenery/trapdoor-centered.png~FL()"
         [/item]
         {PLACE_IMAGE scenery/temple1.png 20 5}
         {GENERIC_UNIT 7 Statue 23 9}