[francetv] Update to fix thumbnail URL issue (#27120)

[francetv] Update to fix thumbnail URL issue (#27120)

Fix the thumbnail URL. The issue was here for many years, never fixed. It's done ! :-)

Example : https://www.france.tv/france-2/de-gaulle-l-eclat-et-le-secret/de-gaulle-l-eclat-et-le-secret-saison-1/2035247-solitude.html

failed thumbnail url generated : http://pluzz.francetv.fr/staticftv/ref_emissions/2020-11-02/EMI_1104da66f533cc7dc5d0d07a181a18c2e2fe1d81_20201014122553940.jpg

right thumbnail url fixed : https://sivideo.webservices.francetelevisions.fr/staticftv/ref_emissions/2020-11-02/EMI_1104da66f533cc7dc5d0d07a181a18c2e2fe1d81_20201014122553940.jpg