Fix braviatv authentication refresh (#37482)

- Bumps bravia-tv lib to 1.0.6 which fixes is_connected() to actually
      return True only when API is connected, instead of just returning whether
      or not cookies are cached (regardless if they actually worked).
    - Wrap is_connected() because it now performs io.
    - Remove unnecessary logic to refresh cookies. Now that
      is_connected() works, the bravia instance only needs to be
      reconnected when is_connected is False and TV is not off.