Fixes #34 memo bug

[BlakeKaufman]

No description provided.

[BlakeKaufman]

In my change, I added this code to the getTunnelConfig route so that people using the API can get the referral revenue. I am pretty sure I have to set the order variable as let order = new Order(), but this is how you had it, so I left it. You might want to check it, though.

if (!!partnerCode) {
        order = new Order();
        order.partnerCode = partnerCode;
        order.amount = data.amount; // get satoshi value from payment response
        order.save((err, doc) => {
          if (err) {
            console.error("Error saving order:", err);
            socket.emit(
              "addAddressCodeError",
              "An error occurred while saving the referral code."
            );
            return;
          }
          console.log("Saved Order successfully!");
        });
      }