Ignore hints on wxTE_PASSWORD controls when not supported natively

There is no way to show the hint without native support in a control with
wxTE_PASSWORD style, so simply ignore them completely in this case.

Closes #17078.

samples/text/text.cpp

@@ -1102,6 +1102,7 @@ MyPanel::MyPanel( wxFrame *frame, int x, int y, int w, int h )
 
     m_password = new MyTextCtrl( this, wxID_ANY, wxT(""),
       wxPoint(10,50), wxSize(140,wxDefaultCoord), wxTE_PASSWORD );
+    m_password->SetHint("Don't use 12345 here");
 
     m_limited = new MyTextCtrl(this, wxID_ANY, "",
                               wxPoint(10, 90), wxDefaultSize);