D16341: Minor cleanups of TabSwitcher plugin

[gregormi]

gregormi accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R40 Kate

BRANCH
  tabswitcher-cleanups (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D16341

To: dhaumann, gregormi
Cc: kwrite-devel, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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