Make the register_axes function always available

It’s still a no-op if the required setting is disabled, but it removes some strain from the Lua interpreter by being
unconditionally available.

default.lua

@@ -9,4 +9,4 @@ stripped_tree.register_strippable_trunk("default:pine_tree", "default:pine_wood"
 
 -- Register axes
 local axe_types = {"axe_wood", "axe_stone", "axe_bronze", "axe_steel", "axe_mese", "axe_diamond"}
-if stripped_tree.axes_strip_trees then stripped_tree.register_axes(mod_name, axe_types) end
+stripped_tree.register_axes(mod_name, axe_types)

ethereal.lua

@@ -13,4 +13,4 @@ stripped_tree.register_strippable_trunk("ethereal:palm_trunk", "ethereal:palm_wo
 
 -- Register axes
 local axe_types = {"axe_crystal"}
-if stripped_tree.axes_strip_trees then stripped_tree.register_axes(mod_name, axe_types) end
+stripped_tree.register_axes(mod_name, axe_types)

functions.lua

@@ -95,8 +95,9 @@ function stripped_tree.maybe_strip_trunk(pos, player, tool, wear)
 end
 
 -- Function to override axes
-if stripped_tree.axes_strip_trees then
-    function stripped_tree.register_axes(mod_n, axe_types)
+function stripped_tree.register_axes(mod_n, axe_types)
+    if stripped_tree.axes_strip_trees ~= true then return end
+
     for _, axe_name in ipairs(axe_types) do
         core.override_item(
             mod_n .. ":" .. axe_name, {
@@ -111,5 +112,4 @@ if stripped_tree.axes_strip_trees then
             }
         )
     end
-    end
 end

moreores.lua

@@ -1,4 +1,4 @@
 -- Register axes
 local axe_types = {"axe_mithril", "axe_silver"}
 
-if stripped_tree.axes_strip_trees then stripped_tree.register_axes("moreores", axe_types) end
+stripped_tree.register_axes("moreores", axe_types)