D18356: [Plasma Theme] Use new connect syntax

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Herald added a project: Frameworks.
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REVISION SUMMARY
  Saves some cycles

TEST PLAN
  Saves like 0.6ms on startup here, given the amount of `Theme` objects created.
  `ThemePrivate` is also a `QObject`, I don't understand why it checks for `qApp` or why it's not done in the `Private`'s constructor though..

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D18356

AFFECTED FILES
  src/plasma/theme.cpp

To: broulik, #plasma
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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