Image files added to queue

[Соколов Илья]

1) Ubuntu 18.10
2) Version: 3.0.0-2
3) & 4) When I use option to add files from folder, album cover images are added to queue. I can't delete them from list because clear button deletes whole queue. And when I try to convert audio, I get error messages on those image files that block further convertion. I have many files that I set to convert overnight, but this is impossible because of those errors.

[GautierPortet (kassoulet)]

Fix committed upstream

https://github.com/kassoulet/soundconverter/commit/7d4aad9bfe78ff31c50ef6ccfa76d9edef45b6eb