Make beds transparent to sunlight

mods/ITEMS/beds/api.lua

@@ -45,6 +45,7 @@ function beds.register_bed(name, def)
 		drawtype = "nodebox",
 		tiles = def.tiles.bottom,
 		paramtype = "light",
+		sunlight_propagates = true,
 		paramtype2 = "facedir",
 		is_ground_content = false,
 		stack_max = 1,
@@ -161,6 +162,7 @@ function beds.register_bed(name, def)
 		tiles = def.tiles.top,
 		paramtype = "light",
 		paramtype2 = "facedir",
+		sunlight_propagates = true,
 		is_ground_content = false,
 		pointable = false,
 		groups = {handy = 1, flammable = 3, bed = 2},