add "delete downloaded files" click box in deleting

[alrcatraz]

Is your feature request related to a problem? Please describe.
sometimes when we delete a download record, we mainly want to remove the downloaded files together with that record, but seems Motrix currently only remove the download record, and we need to delete files manually.

Describe the solution you'd like
A new feature, which would showed like a click box in the pop-up window when deleting download record, asking user if they want to remove the files as well. And this choice can even be memorised so that the next time, the click box would be automatically clicked or unclicked.

Additional context
I think it is a quite classic feature, and many people have used this on other downloader. I believe adding this feature to Motrix would be a wise choice.