D23218: Fix compile warning

[Méven Car]

meven created this revision.
meven added a reviewer: ivan.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
meven requested review of this revision.

REVISION SUMMARY
  Add a Q_UNUSED to avoid a compile warning

TEST PLAN
  Build

REPOSITORY
  R161 KActivity Manager Service

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23218

AFFECTED FILES
  src/common/database/Database.cpp

To: meven, ivan
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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