[Dolibarr/dolibarr] c08345: Update html.formfile.class.php

[pnueda]

  Branch: refs/heads/11.0
  Home:   https://github.com/Dolibarr/dolibarr
  Commit: c083458adf871961e9af1c679dde9a6b959c4d57
      
https://github.com/Dolibarr/dolibarr/commit/c083458adf871961e9af1c679dde9a6b959c4d57
  Author: pnueda <address@hidden>
  Date:   2020-02-08 (Sat, 08 Feb 2020)

  Changed paths:
    M htdocs/core/class/html.formfile.class.php

  Log Message:
  -----------
  Update html.formfile.class.php

Corrects a bug that adds a second '?' in the url string. When strpos returns 0 
as the initial position for '?', it is (mis)taken as FALSE value, and then 
replaced by a second '?' in the list of get parameters, resulting in something 
like:
/compta/facture/card.php?facid=397?action=remove_file...
instead of 
/compta/facture/card.php?facid=397&action=remove_file...