D23615: Improve the look of the KWin options KCM UIs

[Björn Feber]

GB_2 added a task: T10273: Make KCMs consistent and apply the KDE HIG to them as much as possible.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23615

To: GB_2, #kwin, #plasma, #vdg
Cc: ngraham, davidedmundson, zzag, #vdg, #plasma, kwin, #kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart
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