Remove workaround

Upstream confirmed bug fixed in Qt 5.2

src/app/application.cpp

@@ -126,14 +126,6 @@ Application::Application(const QString &id, int &argc, char **argv)
         Preferences::instance()->setWebUiPort(m_commandLineArgs.webUiPort);
     }
 
-#if defined(Q_OS_MACX) && !defined(DISABLE_GUI)
-    if (QSysInfo::MacintoshVersion > QSysInfo::MV_10_8) {
-        // fix Mac OS X 10.9 (mavericks) font issue
-        // https://bugreports.qt-project.org/browse/QTBUG-32789
-        QFont::insertSubstitution(".Lucida Grande UI", "Lucida Grande");
-    }
-#endif
-
     setApplicationName("qBittorrent");
     initializeTranslation();