D12525: Fix build with Qt 5.11 (missing QDoubleValidator)

[Jasem Mutlaq]

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

REPOSITORY
  R321 KStars

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12525

To: asturmlechner, mutlaqja
Cc: #kde_edu, narvaez, apol
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