Rename CApplication member function to be better readable

The combination of the method's name 'signalStartupAutomatically'
and the default argument, I completely misunderstood the purpose
of the method in case the argument was skipped.
'a.signalStartupAutomatically()' actually disabled automatic signaling.

src/swiftguistandard/main.cpp

@@ -25,7 +25,7 @@ int main(int argc, char *argv[])
     CGuiApplication::highDpiScreenSupport();
     QApplication qa(argc, argv);
     CSwiftGuiStdApplication a;
-    a.signalStartupAutomatically(); // application will signal startup on its own
+    a.setSignalStartupAutomatically(false); // application will signal startup on its own
     a.splashScreen(":/own/icons/own/swift/swiftCirclePilotClient1024.png");
     if (!a.start())
     {