D7558: kcms/input: Allow WheelScrollLines = 0; some code cleanup

[Marco Martin]

mart added a comment.


  i don't think the setting makes sense

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D7558

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