gnu: libksysguard: Correct inputs.

* gnu/packages/kde.scm (libksysguard)[inputs]: Remove kdbusaddons,
  kdoctools, kinit, knewstruff, knotifications, kio; add kauth,
  kcompletion, kconfig, kcoreaddons, kwidgetsaddons.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>