D28453: Add missing include QStandardPaths

[Ömer Fadıl Usta]

usta added reviewers: ngraham, knauss, mlaurent.

REPOSITORY
  R94 PIM: Message Library

REVISION DETAIL
  https://phabricator.kde.org/D28453

To: usta, ngraham, knauss, mlaurent
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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