D27507: Use "mail-mark-important" consistently

[David Redondo]

davidre added reviewers: KDE PIM, mlaurent.

REPOSITORY
  R94 PIM: Message Library

REVISION DETAIL
  https://phabricator.kde.org/D27507

To: davidre, #kde_pim, mlaurent
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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