DeliveryModule wasn't correctly retrieved.

[TheCoreDev31]

Previously, the function was getting the first encountered module, event if it wasn't a delivery module.
Therefore, postage data retrieved later (line 414) returned an error.
Now, we get the right delivery module (from the order object).

[anoziere]

Thanks for this. It targets a branch we no longer maintain: the module now lives on main for Thelia 3 and thelia2 for Thelia 2, so we are closing it. If the change still applies, rebase it onto one of those branches and reopen it, or open a new pull request, and we will review it.