Sponsor field is missing on sponsored users when using forced sponsor

[nqb]

Describe the bug
When you use "Forced sponsor" field on a Sponsor portal module, sponsor field of sponsored users is not filled with email address of sponsor. That's not the case if you don't use "Forced sponsor" field.

To Reproduce
Steps to reproduce the behavior:

1. Create a user with Mark a sponsor + email address
2. Configure a portal module with Forced Sponsor using email address of your sponsor user
3. Try to register foo user using portal module defined at last step

Sponsor registration works but foo has an empty sponsor field in DB.

Expected behavior
Sponsor field of sponsored users should contain email address of their sponsor.

Additional context
Issue is caused by the fact that when we called update_person_fields function, we didn't pass sponsor variable (defined above) as argument:

packetfence/html/captive-portal/lib/captiveportal/PacketFence/DynamicRouting/Module/Authentication/Sponsor.pm

Line 212 in ad5f313

$self->update_person_from_fields(additionnal_fields => {notes => $note});

It works for users that don't use "Forced Sponsor" field because update_person_fields function called person_modify function with $self->request_fields and  sponsor email is stored in this hash.

packetfence/html/captive-portal/lib/captiveportal/PacketFence/DynamicRouting/Module/Authentication/Sponsor.pm

Line 173 in ad5f313

my $sponsor = $self->forced_sponsor || $self->request_fields->{sponsor};