Farming: Add quiet sounds to seeds

mods/farming/api.lua

@@ -220,9 +220,14 @@ farming.register_plant = function(name, def)
 			fixed = {-0.5, -0.5, -0.5, 0.5, -5/16, 0.5},
 		},
 		fertility = def.fertility,
+		sounds = default.node_sound_dirt_defaults({
+			dug = {name = "default_grass_footstep", gain = 0.2},
+			place = {name = "default_place_node", gain = 0.25},
+		}),
+
 		on_place = function(itemstack, placer, pointed_thing)
 			return farming.place_seed(itemstack, placer, pointed_thing, mname .. ":seed_" .. pname)
-		end
+		end,
 	})
 
 	-- Register harvest