[Qt] small notificator and style changes

- remove default arguments for notificator
- re-order some calls to use same ordering in Qt files
- style police changes (spaces, comments and such)

src/qt/notificator.h

@@ -29,7 +29,7 @@ public:
     /** Create a new notificator.
        @note Ownership of trayIcon is not transferred to this object.
     */
-    Notificator(const QString &programName=QString(), QSystemTrayIcon *trayIcon=0, QWidget *parent=0);
+    Notificator(const QString &programName, QSystemTrayIcon *trayIcon, QWidget *parent);
     ~Notificator();
 
     // Message class