Default: Enable crafting of mese crystal fragments into mese crystal

mods/default/crafting.lua

@@ -610,6 +610,15 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	output = "default:mese_crystal",
+	recipe = {
+		{"default:mese_crystal_fragment", "default:mese_crystal_fragment", "default:mese_crystal_fragment"},
+		{"default:mese_crystal_fragment", "default:mese_crystal_fragment", "default:mese_crystal_fragment"},
+		{"default:mese_crystal_fragment", "default:mese_crystal_fragment", "default:mese_crystal_fragment"},
+	}
+})
+
 minetest.register_craft({
 	output = 'default:meselamp 1',
 	recipe = {