[FeatureRequest] Add a confirm config for close window when it has a running process

[gutenye]

Is your feature request related to a problem? Please describe.

If you have a running process, then close kitty will show a confirmation.

Kitty does not have a config key for this behavior.

Every day, when I close the app, I always have to press the extra Y button

Describe the solution you'd like

I want Kitty to add a new configuration key, like

confirm_running_os_window_close no

[kovidgoyal]

confirm_os_window_close 0

[gutenye]

Thanks. I knew the -1 value for this key, but missed the 0 value.