[harm_unit]: moved support function bool() to the start of the tag

This change is needed to have the function available for the whole tag.

data/lua/wml-tags.lua

@@ -775,6 +775,13 @@ function wml_actions.harm_unit(cfg)
 	-- #textdomain wesnoth
 	local harmer
 
+	local function bool( value ) -- helper for animate fields
++               -- units will be animated upon leveling or killing, even
++               -- with special attacker and defender values
+		if value then return true
+		else return false end
+	end
+
 	local this_unit = start_var_scope("this_unit")
 
 	for index, unit_to_harm in ipairs(wesnoth.get_units(filter)) do
@@ -912,10 +919,6 @@ function wml_actions.harm_unit(cfg)
 			end
 
 			if kill ~= false and unit_to_harm.hitpoints <= 0 then
-				local function bool( value ) -- support function for kill tag below
-					if value then return true
-					else return false end
-				end
 				wml_actions.kill({ id = unit_to_harm.id, animate = bool( animate ), fire_event = fire_event })
 			end