added undead_variation to a couple of units missing it;

fixes bug #18071: Dwarf Scout line has no undead variation

data/core/units/dwarves/Explorer.cfg

@@ -14,6 +14,7 @@
     alignment=neutral
     advances_to=null
     {AMLA_DEFAULT}
+    undead_variation=dwarf
     cost=45
     usage=scout
     description= _ "Dwarvish Explorers are peerless survivalists. Using only the equipment they carry, they can range for months around the forests and mountains looking for new seams of ore and deposits of minerals. Whilst their skill in a melee is less than some other dwarves, they are unmatched with throwing axes, having practiced this skill hunting in the mountains. Their maneuverability makes them dangerous and tricky foes."

data/core/units/dwarves/Pathfinder.cfg

@@ -18,6 +18,7 @@
     level=2
     alignment=neutral
     advances_to=Dwarvish Explorer
+    undead_variation=dwarf
     cost=30
     usage=scout
     description= _ "These hardy dwarves are sometimes away from their caves for long periods, scouting and patrolling the borders. They spend this time watching for invaders, and fighting bandits and thieves who encroach on dwarvish territory. They are powerful fighters in a melee, and from a distance their deftly thrown axes can rival the power and accuracy of a human archer."

data/core/units/dwarves/Scout.cfg

@@ -18,6 +18,7 @@
     level=1
     alignment=neutral
     advances_to=Dwarvish Pathfinder
+    undead_variation=dwarf
     cost=18
     usage=mixed fighter
     description= _ "Although the dwarves cannot match the taller races in a sprint, when unencumbered by heavy armor their tremendous stamina and endurance allows them to match all but the fastest on foot. Dwarvish Scouts use this to their advantage, ranging ahead of the main force and reporting back on troop movements and dispositions, or securing important objectives. Outside of battle, they are often used to relay messages between dwarvish communities. However, they pay for their speed with the poorer protection provided by their lighter armor."

data/core/units/trolls/Troll_Shaman.cfg

@@ -19,6 +19,7 @@
     alignment=chaotic
     advances_to=null
     {AMLA_DEFAULT}
+    undead_variation=troll
     cost=32
     usage=mixed fighter
     description= _ "Troll shamans are the mystical leaders of the trolls. Though not as strong or tough as other trolls, their true power lies in their fire magic, which they use to blast enemies with gouts of flame."+{SPECIAL_NOTES}+{SPECIAL_NOTES_REGENERATES}+{SPECIAL_NOTES_MAGICAL}