NR S2: fix filters for Micro AIs

and allow L2 recruits if the dwarves are under attack in late game.

[ci skip]

data/campaigns/Northern_Rebirth/scenarios/02_01_Infested_Caves.cfg

@@ -768,7 +768,7 @@
 
         [gold]
             side=4
-            amount=200
+            amount=220
         [/gold]
         [modify_side]
             [filter_side]
@@ -776,6 +776,22 @@
             [/filter_side]
             income=12
         [/modify_side]
+        [if]
+            [variable]
+                name=turn_unmer
+                greater_than=30
+            [/variable]
+            [then]
+                [allow_recruit]
+                    side=4
+                    type=Dwarvish Steelclad,Dwarvish Stalwart,Dwarvish Pathfinder
+                [/allow_recruit]
+                [disallow_recruit]
+                    side=4
+                    type=Dwarvish Fighter,Dwarvish Guardsman,Dwarvish Scout
+                [/disallow_recruit]
+            [/then]
+        [/if]
     [/event]
 
     # This unit should only defend this location and not join the counterattack
@@ -800,7 +816,9 @@
             ai_type=return_guardian
             action=add
             [filter]
-                upkeep=loyal
+                [filter_wml]
+                    upkeep=loyal
+                [/filter_wml]
                 type=Dwarvish Fighter
             [/filter]
             return_x,return_y=27,28
@@ -817,7 +835,9 @@
             ai_type=return_guardian
             action=add
             [filter]
-                upkeep=loyal
+                [filter_wml]
+                    upkeep=loyal
+                [/filter_wml]
                 type=Skeleton Archer
             [/filter]
             return_x,return_y=24,2