Replaced Ok() occurrences with IsOk() throughout trunk.

Additionally renamed wxOSX' private wxNativePrinterDC::Ok() function to IsOk().

Didn't deprecate the various Ok() functions: given the amount of changes already introduced in 3.0 a trivial one like this seems more suitable for after 3.0.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67681 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/stc/stctest.cpp

@@ -430,7 +430,7 @@ void AppFrame::OnPrintPreview (wxCommandEvent &WXUNUSED(event)) {
         new wxPrintPreview (new EditPrint (m_edit),
                             new EditPrint (m_edit),
                             &printDialogData);
-    if (!preview->Ok()) {
+    if (!preview->IsOk()) {
         delete preview;
         wxMessageBox (_("There was a problem with previewing.\n\
                          Perhaps your current printer is not correctly?"),