D15575: Removes some warnings from the program by replacing deprecated methods

[Edoarda Vallim]

vallim added reviewers: tcanabrava, KDE Edu.

REPOSITORY
  R332 Kiten

REVISION DETAIL
  https://phabricator.kde.org/D15575

To: vallim, tcanabrava, #kde_edu
Cc: kde-edu, narvaez, apol
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