Fix arguments in `mc_unpackers`

Fixes bug introduced by a late to change to LHCb!3395 (merged) that was not mirrored in !1299 (merged).

See LHCb#189 for more info on discussion around use of output_level and bind

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• 1f304a73 - Fixed formatting

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mentioned in commit a6d7c103

mentioned in issue #390 (closed)