Refactor lightfly movetype a bit

data/core/units.cfg

@@ -826,36 +826,12 @@ The life span of the wose is unknown, although the most ancient members of this
         name=lightfly
         flies=true
         [movement_costs]
-            deep_water=1
-            shallow_water=1
-            reef=1
-            swamp_water=1
-            flat=1
-            sand=1
-            forest=1
-            hills=1
-            mountains=1
-            village=1
-            castle=1
-            frozen=1
-            unwalkable=1
+            {FLY_MOVE}
             cave=3
             fungus=3
         [/movement_costs]
         [defense]
-            deep_water=40
-            shallow_water=40
-            reef=40
-            swamp_water=40
-            flat=40
-            sand=40
-            forest=40
-            hills=40
-            mountains=40
-            village=40
-            castle=40
-            frozen=40
-            unwalkable=40
+            {FLY_DEFENSE 40}
             cave=70
             fungus=70
         [/defense]