fix weapon sound selection

api.lua

@@ -8,7 +8,7 @@ local use_cmi = minetest.global_exists("cmi")
 
 mobs = {
 	mod = "redo",
-	version = "20210515",
+	version = "20210527",
 	intllib = S,
 	invis = minetest.global_exists("invisibility") and invisibility or {}
 }
@@ -2917,14 +2917,9 @@ function mob_class:on_punch(hitter, tflp, tool_capabilities, dir, damage)
 	-- only play hit sound and show blood effects if damage is 1 or over
 	if damage >= 1 then
 
-		local snd
-
-		-- weapon sounds
-		if weapon_def.sounds then
-			snd = weapon_def.sounds[random(#weapon_def.sounds)]
-		else
-			snd = "default_punch"
-		end
+		-- select tool use sound if found, or fallback to default
+		local snd = weapon_def.sound and weapon_def.sound.use
+				or "default_punch"
 
 		minetest.sound_play(snd, {object = self.object, max_hear_distance = 8}, true)