FIX: Overlay mode isn't applied via config file.

[SaeGon-Heo]

If I drag & drop config.kpsconf3 file on KeysPerSecond-v8.4.exe to run it with saved config which Overlay mode is true,
Overlay mode option is enabled but doesn't applied.
And this PR may fix this.

[RoanH]

Hey, thank you for the bug report and pull request. Nice job finding this bug. Your fix works properly, but the underlying issue is a bit more involved (honestly configuration files should be handled better, I'll get around to that someday). The stats saving is actually suffering from the exact same issue, for some reason I decided to manually manage the state of a few things even though I have a subroutine called reconfigure to do exactly that... And it seems like the manual managing did not work out for the overlay option and stats saving.

I'll push a few commits of my own to fix stats saving and then I'll merge this if you're fine with the changes I've made.

[RoanH]

I've made all the changes I wanted to make, if you're fine with the changes I made please approve or leave a comment and I'll merge this. Thanks again for contributing!

[SaeGon-Heo]

Looks cool. I didn't noticed reconfigure() function does at all :)
You may go ahead with that. Thanks to patch a bug!

[RoanH]

Awesome, thanks for the contribution.