Fix lupdate warning in playlistparser.
Fix lupdate warning in playlistparser.

playlistfileparser.cpp:278: Class 'PLSParser' lacks Q_OBJECT macro.

Change-Id: I062bd90b7cd5de82683dc02c6a6400855982a163
Reviewed-by: Yoann Lopes <27570619e45a2a46618012b16a29b452c478e806@digia.com>

mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia