Remove notification when app closes

Merged gregorni requested to merge removed-notifications into main

Currently, when the app sends a Done Upscaling notification, that notification remains when the app is closed. This MR removes the notification when the app is closed.

When multi-window support is dropped with !2, this code can be improved by putting the withdraw_notification command in somewhere (probably do_close_request), however, for now it's better to keep it in

Edited by gregorni

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