The program doen't close without using Task Manager

[CezarGab]

          NOTE: The program doen't close. You have to go to the task manager to end task since an error apperars with a label error which when you click ok doen't actually terminate the program. So a `os._exit(1)` function on exit must be implemented.

Originally posted by @xtho25 in https://github.com/CezarGab/Overlyrics/issues/7#issuecomment-2127589697

I'll think about the best solution to implement. Perhaps a simple “x” in the top left corner.