D27065: Fix inverted logic in IOKitStorage::isRemovable

[Milian Wolff]

mwolff added a reviewer: Frameworks.

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D27065

To: mwolff, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns