TrayIcon: Use KAboutApplicationDialog

Rather than indirect via KHelpMenu. It is only created on the stack,
and when it gets destroyed, the dialog would get destroyed, too,
and not show at all.

krfb/trayicon.cpp

@@ -15,9 +15,9 @@
 #include <QMenu>
 
 #include <KAboutApplicationDialog>
+#include <KAboutData>
 #include <KActionCollection>
 #include <QDialog>
-#include <KHelpMenu>
 #include <KLocalizedString>
 #include <KStandardAction>
 #include <KToggleAction>
@@ -129,6 +129,7 @@ void TrayIcon::onClientDisconnected(RfbClient* client)
 
 void TrayIcon::showAbout()
 {
-    KHelpMenu menu;
-    menu.aboutApplication();
+    auto *dialog = new KAboutApplicationDialog(KAboutData::applicationData());
+    dialog->setAttribute(Qt::WA_DeleteOnClose);
+    dialog->show();
 }