D11429: Fix build with Qt 5.11 (missing QRegExpValidator)

[Daniel Nicoletti]

dantti accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R363 Print Manager

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11429

To: asturmlechner, dantti
Cc: kde-utils-devel
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