D12575: Fix crash on close.

[David Faure]

dfaure created this revision.
dfaure added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  We must dissociate the theme manager from the action group and the menu
  before these get deleted.

TEST PLAN
  Opening a reader window and closing it; quitting kmail.

REPOSITORY
  R81 KDE PIM Addons

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D12575

AFFECTED FILES
  plugins/messageviewerheaderplugins/grantleeheaderstyleplugin/grantleeheaderstyleinterface.cpp

To: dfaure, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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