D6216: simplify positioning code

[Marco Martin]

mart added inline comments.

INLINE COMMENTS

> davidedmundson wrote in notificationshelper.cpp:294
> I find it odd that we use the contentItem height not the window height which includes the frame margins.
> 
> Especially given that whole other patch is about making sure the window is resized to the contentItem.

didn't change that, giving a try to it, may simplify things further

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D6216

To: mart, #plasma
Cc: davidedmundson, plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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