message: Fix incorrect buffer size in AssocQueryString use
  Found by static analysis: buffer size is in # of characters, not bytes.
diff: @@ -1295,7 +1295,7 @@ void PoeditApp::AssociateFileTypeIfNeeded()
  // registry record in this case.
  wchar_t buf[1000];
  - DWORD bufSize = sizeof(buf);
  + DWORD bufSize = WXSIZEOF(buf);
  HRESULT hr = AssocQueryString(ASSOCF_INIT_IGNOREUNKNOWN,
  ASSOCSTR_EXECUTABLE,
  L".po", NULL,
  