UtBS Out of the Frying Pan: set goals for messenger side units

This is needed to keep the units from sitting around and doing nothing
in some situations after the messenger has been killed.

data/campaigns/Under_the_Burning_Suns/scenarios/08_Out_of_the_Frying_Pan.cfg

@@ -3980,6 +3980,30 @@
             speaker=Kaleh
             message= _ "Good. We’re safe for now. We just have to defeat Durstrag before he sends another messenger for reinforcements."
         [/message]
+
+        # Remaining units of the messenger side must remain active
+        [modify_ai]
+            side=8
+            action=add
+            path=goal
+            [goal]
+                [criteria]
+                    side=1
+                [/criteria]
+                value=10
+            [/goal]
+        [/modify_ai]
+        [modify_ai]
+            side=8
+            action=add
+            path=goal
+            [goal]
+                [criteria]
+                    side=5
+                [/criteria]
+                value=1
+            [/goal]
+        [/modify_ai]
     [/event]
 
     # Event 19: Messenger Escapes!