Fix local folder URL

Signed-off-by: Dominique Fuchs <32204802+DominiqueFuchs@users.noreply.github.com>

src/gui/tray/UserModel.cpp

@@ -44,7 +44,8 @@ ActivityListModel *User::getActivityModel()
 
 void User::openLocalFolder()
 {
-    QDesktopServices::openUrl(this->getFolder()->path());
+    QString path = "file://" + this->getFolder()->path();
+    QDesktopServices::openUrl(path);
 }
 
 void User::login() const