DW: Fix wesnoth#3207

...by preventing any allied units from moving to the sword.

(cherry-picked from commit 85ba779)

data/campaigns/Dead_Water/scenarios/10_The_Flaming_Sword.cfg

@@ -919,6 +919,18 @@
             # the top of the screen).
         [/delay]
 
+        # Prevent any possibility of Villagers blocking pickup of the sword
+        # Could happen if one is standing on the sword when the last enemy unit is killed
+        [modify_side]
+            side=3
+            [ai]
+                [avoid]
+                    x=$sword_x
+                    y=$sword_y
+                [/avoid]
+            [/ai]
+        [/modify_side]
+
         [message]
             speaker=Kai Krellis
             message= _ "Now we can finally grab that sword."