Fix autostart write path (#1979)

* Fix autostart write path (flameshot-org#1975)

* Fix formating

src/utils/confighandler.cpp

@@ -250,9 +250,9 @@ void ConfigHandler::setStartupLaunch(const bool start)
                    << process.readAll();
     }
 #elif defined(Q_OS_LINUX) || defined(Q_OS_UNIX)
-    QString path = QStandardPaths::locate(QStandardPaths::GenericConfigLocation,
-                                          "autostart/",
-                                          QStandardPaths::LocateDirectory);
+    QString path =
+      QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation) +
+      "/autostart/";
     QDir autostartDir(path);
     if (!autostartDir.exists()) {
         autostartDir.mkpath(".");