fix file names format in wxFileDataObject::GetDataHere() in Unicode build (replaces patch 1785191)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48610 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/ole/dataobj.cpp

@@ -1139,7 +1139,7 @@ bool wxFileDataObject::GetDataHere(void *WXUNUSED_IN_WINCE(pData)) const
 #endif // wxUSE_UNICODE_MSLU
         {
             len = m_filenames[i].length();
-            memcpy(pbuf, m_filenames[i].c_str(), len*sizeOfChar);
+            memcpy(pbuf, m_filenames[i].wx_str(), len*sizeOfChar);
         }
 
         pbuf += len*sizeOfChar;