D26300: Port endl to \n as QTextStream is flushed at the end. endl is namespaced in qt5.15

[Laurent Montel]

mlaurent added a reviewer: dfaure.

REPOSITORY
  R301 KEmoticons

REVISION DETAIL
  https://phabricator.kde.org/D26300

To: mlaurent, dfaure
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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