Embed the image into the event sample

Don't load it from the image sample directory, this doesn't necessarily
work under Unix if the image sample hadn't been built.

Just embed an XPM image directly into the sample, this is good enough
for demonstration purposes.

samples/event/event.cpp

@@ -298,8 +298,6 @@ bool MyApp::OnInit()
     if ( !wxApp::OnInit() )
         return false;
 
-    wxImage::AddHandler(new wxJPEGHandler);
-
     // create the main application window
     MyFrame *frame = new MyFrame(wxT("Event wxWidgets Sample"),
                                  wxPoint(50, 50), wxSize(600, 340));