Don't log drag events as well as move ones in the text sample

Dragging the mouse (even accidentally by a pixel or two) resulted in a
confusing "Unknown event" line in the log, so don't log these messages neither
just as we already don't log the mouse motion events.

samples/text/text.cpp

@@ -776,7 +776,7 @@ void MyTextCtrl::OnMouseEvent(wxMouseEvent& ev)
     if ( !ms_logMouse )
         return;
 
-    if ( !ev.Moving() )
+    if ( !ev.GetEventType() != wxEVT_MOTION )
     {
         wxString msg;
         if ( ev.Entering() )