TSG 5: ensure no additional event is triggered during allying

Ensure that allying with the bandits does not trigger the lich sighted event.
It's unlikely that the bandits advanced that far though.

[ci skip]

data/campaigns/The_South_Guard/scenarios/05_Choice_In_The_Fog.cfg

@@ -77,6 +77,12 @@
             recruitment_pattern=fighter,scout,scout
             {QUANTITY aggression 0.3 0.4 0.5}
             {ATTACK_DEPTH 3 4 5}
+            # In case a unit is there when they sitch to side 1 it would trigger
+            # the lich sighted event. Quick Footpads can see up to 9 hexes ahead.
+            [avoid]
+                location_id=4
+                radius=9
+            [/avoid]
         [/ai]
         recruit=Footpad, Thug
         {FLAG_VARIANT6 ragged}