D29216: Remove dead code since KF5.0: mount/umount devices in their contextmenu

[David Faure]

dfaure closed this revision.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D29216

To: dfaure, apol, broulik
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns