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tapfreighter: create anchor output keys correctly

Once we have multiple asset IDs (and with that multiple distinct virtual
packets), we need to make sure that we create our anchor outputs
correctly.
We need to make sure that the anchor outputs for the same index are
actually the same (e.g. same internal key). If we just blindly loop over
them and assign new keys, then two virtual outputs that reference the
same anchor output index would have different keys and we'd fail a check
then attempting to commit those packets to a BTC anchor transaction.