AOI: Fix errors found by schema validator

- grouping=no, not grouping=none
- speaker is a message key not a filter key

With this, AOI is clean of schema issues.

data/campaigns/An_Orcish_Incursion/scenarios/02_Assassins.cfg

@@ -179,7 +179,7 @@
     [event]
         name=last breath
         [filter]
-            speaker=Gharlsa
+            id=Gharlsa
         [/filter]
 
         [message]

data/campaigns/An_Orcish_Incursion/scenarios/04_Valley_of_Trolls.cfg

@@ -87,7 +87,7 @@
             aggression=-0.1
             simple_targeting=yes
             turns="1,2,3,7,8,9,13,14,15,19,20,21"
-            grouping=none
+            grouping=no
             {ATTACK_DEPTH 1 3 5}
         [/ai]
     [/side]
@@ -126,7 +126,7 @@
         [ai]
             aggression=-0.1
             turns="1,2,3,7,8,9,13,14,15,19,20,21"
-            grouping=none
+            grouping=no
             attack_depth=5
             simple_targeting=yes
         [/ai]