D7559: Use KActionCollection::setDefaultShortcut

[Heiko Becker]

heikobecker created this revision.

REVISION SUMMARY
  ...instead of QAction::setShortcut, which removes some run-time warnings.

TEST PLAN
  Build and checked that shortcuts still work

REPOSITORY
  R423 Palapeli

BRANCH
  frameworks

REVISION DETAIL
  https://phabricator.kde.org/D7559

AFFECTED FILES
  src/window/mainwindow.cpp

To: heikobecker, #kde_games
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