Mainline campaigns: don't use aggression > 1

aggression=1 is the largest sensible value.  For larger values, the AI
actually prefers attacks in which it receives more damage, leading to
it choosing the wrong attacks.

data/campaigns/Descent_Into_Darkness/scenarios/03_A_Haunting_in_Winter.cfg

@@ -94,7 +94,7 @@
         fog=no
         shroud=no
         [ai]
-            aggression=4.0
+            aggression=1.0
             caution=0.0
             grouping=no
             simple_targeting=yes

data/campaigns/Legend_of_Wesmere/scenarios/chapter3/09_Bounty_Hunters.cfg

@@ -462,8 +462,7 @@ Chapter Three"
         user_team_name= _ "Creatures"
         faction=Custom
         [ai]
-            #TODO these values seem wrong
-            aggression=200.0
+            aggression=1.0
             caution=-100.0
             grouping=no
             [avoid]

data/campaigns/Liberty/scenarios/05_Hide_and_Seek.cfg

@@ -64,7 +64,7 @@
         team_name=bad_guys
         user_team_name=_"Asheviere"
         [ai]
-            aggression=2.0
+            aggression=1.0
             caution=0.0
             grouping=no
             simple_targeting=yes

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

@@ -79,7 +79,7 @@
 
         canrecruit=yes
         [ai]
-            aggression=2.0
+            aggression=1.0
             grouping=no
             attack_depth=1
             village_value=0