LoW7: Fix invalid use of aspects in [unit][ai]

This doesn't quite produce what is presumed to be the intended result.
It does at least preserve the differing recruitment patterns though.

Includes the following recommendations from mattsc:

- Drop {AI_NO_SCOUTS} since the recruitment pattern contradicts it
- Drop attack_depth and grouping
- Keep the night-only aggression and caution change, even for the nagas

data/campaigns/Legend_of_Wesmere/scenarios/chapter2/07_Elves_Last_Stand.cfg

@@ -238,15 +238,6 @@
 #ifdef EASY
             extra_recruit=Orcish Archer, Orcish Crossbowman, Orcish Assassin, Orcish Grunt, Orcish Warrior, Goblin Spearman, Wolf Rider, Goblin Knight, Goblin Pillager
 #endif
-
-            [ai]
-                {AI_NO_SCOUTS}
-                {AI_SIMPLE_ALWAYS_ASPECT recruitment_pattern "scout,fighter,fighter,archer,mixed fighter"}
-                {AI_SIMPLE_NIGHT_ASPECT aggression 0.75}
-                {AI_SIMPLE_NIGHT_ASPECT caution 0.0}
-                {AI_SIMPLE_NIGHT_ASPECT grouping no}
-                {AI_SIMPLE_NIGHT_ASPECT attack_depth 5}
-            [/ai]
         [/unit]
 
         [unit]
@@ -265,20 +256,31 @@
 #ifdef HARD
             extra_recruit=Troll Whelp, Troll, Troll Rocklobber, Troll Shaman, Troll Warrior, Troll Hero
 #endif
+        [/unit]
 
-            [ai]
-                {AI_NO_SCOUTS}
+        [ai]
+            {AI_SIMPLE_NIGHT_ASPECT aggression 0.75}
+            {AI_SIMPLE_NIGHT_ASPECT caution 0.0}
+            [recruitment_instructions]
+                [recruit]
+                    importance=0
+                [/recruit]
+                [pattern]
+                    importance=1
+                    leader_id=Truugl
 #ifdef EASY
-                {AI_SIMPLE_ALWAYS_ASPECT recruitment_pattern "fighter"}
+                    type="fighter"
 #else
-                {AI_SIMPLE_ALWAYS_ASPECT recruitment_pattern "fighter, mixed fighter, fighter, mixed fighter, fighter"}
+                    type="fighter, mixed fighter, fighter, mixed fighter, fighter"
 #endif
-                {AI_SIMPLE_NIGHT_ASPECT aggression 0.75}
-                {AI_SIMPLE_NIGHT_ASPECT caution 0.0}
-                {AI_SIMPLE_NIGHT_ASPECT attack_depth 5}
-                {AI_SIMPLE_NIGHT_ASPECT grouping offensive}
-            [/ai]
-        [/unit]
+                [/pattern]
+                [pattern]
+                    importance=1
+                    leader_id=Urug-Pir
+                    type="scout,fighter,fighter,archer,mixed fighter"
+                [/pattern]
+            [/recruitment_instructions]
+        [/ai]
     [/side]
 
     ### /ENEMIES ####