Added test for default action (button normally)

  Added test for default action (button normally)
    to combo box when hittinh return. In a normal
    Find&Replace dialog, hitting enter in one of
    the two fields will usually mean "OK".
  Corrected the same test in wxTextCtrl.
  Removed some debug code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775