D7620: Fix KHelpMenu position on Wayland

[Elvis Angelaccio]

elvisangelaccio created this revision.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  This fixes the transient parent of KHelpMenu, which is required
  to properly position the popup on Wayland.

TEST PLAN
  open Help menu from dolphin Control button.

REPOSITORY
  R263 KXmlGui

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7620

AFFECTED FILES
  src/khelpmenu.cpp

To: elvisangelaccio, #frameworks
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