Fixed Warven's mountain movement cost not changing back to normal...

...when he turns into a normal Sergeant, and removed an unused variable.

data/campaigns/Heir_To_The_Throne/scenarios/19c_Cliffs_of_Thoria.cfg

@@ -864,10 +864,27 @@ Soooo... It is you who sent your subordinates to attack us. Now when we’ve des
             y=15,16,15,17,15,16
         [/filter]
 
-        {MODIFY_UNIT id=Warven side 1}
-        {MODIFY_UNIT id=Warven type Sergeant}
+        [kill]
+            id=Warven
+        [/kill]
 
-        {VARIABLE have_warven yes}
+        [unit]
+            type=Sergeant
+            side=1
+            x=45
+            y=16
+            id=Warven
+            name= _ "Warven"
+            hitpoints=1
+            [modifications]
+                {TRAIT_LOYAL}
+                {TRAIT_FEARLESS}
+            [/modifications]
+            {IS_LOYAL}
+            [status]
+                poisoned=yes
+            [/status]
+        [/unit]
 
         [message]
             speaker=Warven