Fix: Logout video removing

[PavloNetrebchuk]

Fixed removing video after user logs out.

AbstractDownloader kept a reference to the last file so it could delete incomplete downloads, but it didn’t clear that reference after a file was successfully downloaded, which caused the most recently downloaded file to be deleted on logout.

SettingsViewModel#logout() -> WorkerController#removeModels() -> FileDownloader#cancelDownloading()

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