Import WireGuard config QR images

[ignoramous]

My first "hotfix" was to have a QR code saved as .jpg and just reload the configuration when it's gone and ended up finding that the Import does not process images (I select the configuration file 'Unknown "invalid file" error'.. Only then it occurred to me that the Import is for conf or zip files.)... Except I can't import .conf files because they don't show up at all, and txt files are not processed at all, so I guess I'm opening another issue. with the default Samsung file browser, but works fine with a third party one.

Originally posted by @Mywk in #1865