D16653: Use the new `drive-harddisk-root` icon for the root volume

[Nathaniel Graham]

ngraham added a reviewer: bruns.

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D16653

To: ngraham, romangg, #vdg, #dolphin, #frameworks, bruns
Cc: kde-frameworks-devel, michaelh, ngraham, bruns