Fix missing feeRecipientAddress in order creation in scenario execute_transaction

[NicolasMahe]

Revert one modification done in commit 402c161 in the order creation in the execute_transaction scenario.

It sets the value NULL_ADDRESS to feeRecipientAddress in the order. But, actually there is a variable feeRecipientAddress containing the sender.

Here is what the commit 402c161 changes:

-        feeRecipientAddress,
+        feeRecipientAddress: NULL_ADDRESS,

Source: 402c161#diff-ef096bf973c00c822cc64544b6e0364735358e0db5c7915e7df4a7c8e7968d8cL111-R114

This PR simply reverts this modification.

Moreover, I think the senderAddress should also be set to sender to only authorised sender to submit the order. What do you think?