bug: windows `self_delete` stuck

[erhant]

Reported by muuge on Discord, its due to the way self_delete works in Windows: https://docs.rs/self-replace/latest/self_replace/fn.self_delete.html

The deletion on windows is delayed until the process shuts down. For updating instead of deleting, use self_replace instead. Not that you must only only call this function once during the execution of the program and you should exist quickly afterwards to make the delete take effect on Windows.

Perhaps there is an issue with the way launcher updates stuff?