"Checklist" project, handle appearance when in dark mode

When running the final “Checklist” project on my device, I’ve noticed that there is no proper handling for a case when the device is in dark mode.

The main effect is that the checklist icon will not show in the table cells.

Screen Shot 2022-07-07 at 10.10.40

The solution is relatively simple and I believe it would be a nice addition to the book.

Screen Shot 2022-07-07 at 10.11.03