D23351: Simplify ctors with default member initializer

[Filip Gawin]

gawin added a reviewer: Kate.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D23351

To: gawin, #kate
Cc: #kate, kwrite-devel, domson, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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