Option to not extract directory receives

[Jacalz]

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

We are currently extracting the zip files from directories sends automatically. This works well when we have full file system access but makes it hard if we want to go through mobile file pickers or Flatpak portals (just giving access to the file that the user asks to create).

This should also allow us to implement the option to ask where to safe files, hence solving #45.

Describe the solution you'd like to see:

A setting to not extract files. This should be forced to on (there is currently no other option for directory sends) if the user enables asking where to save files.