fix: do not trash instances in Flatpak

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

launcher/Application.cpp

@@ -1136,15 +1136,6 @@ std::vector<ITheme *> Application::getValidApplicationThemes()
     return ret;
 }
 
-bool Application::isFlatpak()
-{
-    #ifdef Q_OS_LINUX
-    return QFile::exists("/.flatpak-info");
-    #else
-    return false;
-    #endif
-}
-
 void Application::setApplicationTheme(const QString& name, bool initial)
 {
     auto systemPalette = qApp->palette();