Sort loot registration into respective mods (#2602)

mods/farming/init.lua

@@ -144,3 +144,13 @@ minetest.register_craft({
 	recipe = "farming:hoe_wood",
 	burntime = 5,
 })
+
+-- Register farming items as dungeon loot
+if minetest.global_exists("dungeon_loot") then
+	dungeon_loot.register({
+		{name = "farming:string", chance = 0.5, count = {1, 8}},
+		{name = "farming:wheat", chance = 0.5, count = {2, 5}},
+		{name = "farming:seed_cotton", chance = 0.4, count = {1, 4},
+			types = {"normal"}},
+	})
+end

mods/farming/mod.conf

@@ -1,3 +1,4 @@
 name = farming
 description = Minetest Game mod: farming
 depends = default, wool, stairs
+optional_depends = dungeon_loot