XRC: File bugs in wxFileCtrl spec, schema and samples.

Incredibly, there were bugs, inaccuracies or missing content in all
three of them, but each one had its own unique problems.  Fix them all
to be in sync with the implementation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75041 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

misc/schema/xrc_schema.rnc

@@ -760,9 +760,9 @@ wxFileCtrl =
         attribute class { "wxFileCtrl" } &
         stdObjectNodeAttributes &
         stdWindowProperties &
-        [xrc:p="o"] element value    {_, t_string }* &
-        [xrc:p="r"] element message  {_, t_text }+ &
-        [xrc:p="o"] element wildcard {_, t_string }*
+        [xrc:p="o"] element defaultdirectory {_, t_string }* &
+        [xrc:p="o"] element defaultfilename  {_, t_string }* &
+        [xrc:p="o"] element wildcard         {_, t_string }*
     }