message: Fix ResizePseudoConsole accepting negative values
  Closes
diff: @@ -200,7 +200,7 @@ HRESULT _CreatePseudoConsole(const HANDLE hToken,
  // write the resize message to the pty.
  HRESULT _ResizePseudoConsole(_In_ const PseudoConsole* const pPty, _In_ const COORD size)
  {
  - if (pPty == NULL)
  + if (pPty == NULL || size.X < 0 || size.Y < 0)
  {
  return E_INVALIDARG;
  }
  