D7570: Use KActionCollection::setDefaultShortcut

[Heiko Becker]

heikobecker created this revision.

REVISION SUMMARY
  ...instead of QAction::setShortcut, which removes a run-time warning.

TEST PLAN
  Builds, warning disappears and shortcut still works

REPOSITORY
  R341 Step

BRANCH
  Applications/17.08

REVISION DETAIL
  https://phabricator.kde.org/D7570

AFFECTED FILES
  step/mainwindow.cc

To: heikobecker, #kde_edu
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