D10830: Disable SplitterProxy by default since it's broken

[Kai Uwe Broulik]

broulik added a reviewer: hpereiradacosta.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D10830

To: aacid, hpereiradacosta
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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