Use APPLICATION_ICON_NAME for autostart icon

Signed-off-by: Nicolas Fella <nicolas.fella@gmx.de>

src/common/utility_unix.cpp

@@ -76,7 +76,7 @@ void setLaunchOnStartup_private(const QString &appName, const QString &guiName,
            << QLatin1String("GenericName=") << QLatin1String("File Synchronizer") << endl
            << QLatin1String("Exec=") << QCoreApplication::applicationFilePath() << endl
            << QLatin1String("Terminal=") << "false" << endl
-           << QLatin1String("Icon=") << appName.toLower() << endl // always use lowercase for icons
+           << QLatin1String("Icon=") << APPLICATION_ICON_NAME << endl
            << QLatin1String("Categories=") << QLatin1String("Network") << endl
            << QLatin1String("Type=") << QLatin1String("Application") << endl
            << QLatin1String("StartupNotify=") << "false" << endl