hintitem use 'QRandomGenerator' instead of 'qrand'
Fix cppcheck issue "gui/hintitem.cc:40: Obsolete function 'qrand' called. It is recommended to use 'QRandomGenerator' instead.".
Fix cppcheck issue "gui/hintitem.cc:40: Obsolete function 'qrand' called. It is recommended to use 'QRandomGenerator' instead.".