call OnInit() from all samples to allow using standard command line options with all of them (patch 1623971)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44354 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dynamic/dynamic.cpp

@@ -66,6 +66,9 @@ IMPLEMENT_APP  (MyApp)
 // `Main program' equivalent, creating windows and returning main app frame
 bool MyApp::OnInit(void)
 {
+    if ( !wxApp::OnInit() )
+        return false;
+
     // Create the main frame window
     MyFrame *frame = new MyFrame(NULL, _T("Dynamic wxWidgets App"), 50, 50, 450, 340);