DiD: give Mal Keshar better movement

data/campaigns/Descent_Into_Darkness/units/Mal_Keshar.cfg

@@ -202,6 +202,10 @@
     experience=37
 #endif
     advances_to=null
+    [movement_costs]
+        cave=1
+        fungus=1
+    [/movement_costs]
     [attack]
         name=touch
         description=_"touch"
@@ -263,6 +267,10 @@
     usage=mixed fighter
     description= _ "A lich that accrues enough power over its newfound immortal lifespan becomes one who can stain souls with despair and sow ruin across the world. Invariably in command of a nigh-limitless horde of risen warriors and undead monsters, a lich of this order has a mastery of dark sorcery that can bring dread to the most storied magi of human and elven kind. Such a figure usually marks a dark and bloody chapter in history, and in those times of need, it is only through the tireless efforts of the most valiant heroes that the rise of an Ancient Lich has not led to the shadows ruling the world for the rest of time."
     {DEFENSE_ANIM "units/undead-necromancers/ancient-lich-defend.png" "units/undead-necromancers/ancient-lich.png" {SOUND_LIST:LICH_HIT} }
+    [movement_costs]
+        cave=1
+        fungus=1
+    [/movement_costs]
     [attack]
         name=touch
         description=_"touch"