Fix bug caused by packing unsigned int instead of unsigned_int as size
Fix bug caused by packing unsigned int instead of unsigned_int as size

Wrong pack function was getting called because of this typo.

(cherry picked from commit bb74d3ae4f262272be364a937bd644e82bc0f295)

EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos,EOSIO/eos