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/ownerdrw/ownerdrw.cpp

@@ -88,6 +88,9 @@ IMPLEMENT_APP(OwnerDrawnApp)
 // init our app: create windows
 bool OwnerDrawnApp::OnInit(void)
 {
+    if ( !wxApp::OnInit() )
+        return false;
+
     OwnerDrawnFrame *pFrame
         = new OwnerDrawnFrame(NULL, _T("wxWidgets Ownerdraw Sample"),
                               50, 50, 450, 340);