D17907: [KWidgetsAddons] Do not use light font styles for headings (3/3)

[Root]

rooty edited reviewers, added: VDG, Plasma; removed: cfeck.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D17907

To: rooty, ngraham, #frameworks, #vdg, #plasma, cfeck
Cc: kde-frameworks-devel, michaelh, ngraham, bruns