Use castle's stbi instead of zstbi

src/Player.zig

@@ -264,7 +264,7 @@ pub fn onMouseDown(self: *Player, button: glfw.MouseButton, game: *Game) void {
             },
             .right => blk: {
                 const target_vx = raycast_hit.voxel.add(raycast_hit.side.getSignVector());
-                const id = game.blocks.getOrLoad(game.engine, &game.materials, &game.textures, blocks[self.block_index], game.allocator) catch |err| {
+                const id = game.blocks.getOrLoad(game.engine, &game.materials, &game.textures, &game.stbi, blocks[self.block_index], game.allocator) catch |err| {
                     std.log.err("Error while placing voxel at {f}: {}", .{ target_vx, err });
                     break :blk;
                 };