Fix wxScopedCharTypeBuffer<T>::CreateOwned() to match docs.

The documentation says that it takes ownership of the memory block
passed to it, but the implementation made a copy.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64209 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/buffer.h

@@ -74,7 +74,7 @@ public:
         @param len If specified, length of the string, otherwise the string
                    is considered to be NUL-terminated.
      */
-    static const wxScopedCharTypeBuffer CreateOwned(const CharType *str, size_t len = wxNO_LEN);
+    static const wxScopedCharTypeBuffer CreateOwned(CharType *str, size_t len = wxNO_LEN);
 
     /**
         Copy constructor.