[ReceiveFileJob] Override desktopFileName
Pretend to be part of BlueDevil's file transfer agent even though we're run inside kded
Now shows this
instead of "KDE Daemon".
This needs frameworks/kio@cfa6b12c but since BlueDevil is part of Plasma which supports V2 and will depend on KIO with this version in next release, we can assume that overriding desktopFileName
will work.