explain need for QApplication call in unit test

Tests/Unit/GUI/TestAutosaveController.cpp

@@ -100,7 +100,7 @@ TEST_F(TestAutosaveController, autoSaveControllerNewDocument)
 
 TEST_F(TestAutosaveController, autosaveEnabled)
 {
-    QApplication::setOrganizationName("BornAgain");
+    QApplication::setOrganizationName("BornAgain"); // autosave to directory ~/.config/BornAgain
     const QString projectDir("autosaveEnabled");
     UTest::GUI::create_dir(projectDir);
     const QString ext = QString(GUI::Project::Utils::projectFileExtension);