MT#56735 /api/billingprofiles fix reseller_id on update

* /api/billingprofiles PUT/PATCH reseller_id for "reseller" roles is forced
  to the user one, to address an issue when reseller_id becomes
  required on PUT/PATCH

Change-Id: I3fa556c5db5556c75bf481d18b51df6c400a1944

lib/NGCP/Panel/Role/API/BillingProfiles.pm

@@ -122,8 +122,12 @@ sub update_profile {
     #}
 
     $form //= $self->get_form($c);
-    # TODO: for some reason, formhandler lets missing reseller slip thru
-    $resource->{reseller_id} //= undef;
+    if ($c->user->roles eq "reseller") {
+        $resource->{reseller_id} = $c->user->reseller_id;
+    } else {
+        # TODO: for some reason, formhandler lets missing reseller slip thru
+        $resource->{reseller_id} //= undef;
+    }
     return unless $self->validate_form(
         c => $c,
         form => $form,