increase MAX_UNREWARDED_RELAYERS_IN_CONFIRMATION_TX and MAX_UNCONFIRMED_MESSAGES_IN_CONFIRMATION_TX for RBH/WBH (#1765)

* increase MAX_UNREWARDED_RELAYERS_IN_CONFIRMATION_TX and MAX_UNCONFIRMED_MESSAGES_IN_CONFIRMATION_TX for RBH/WBH

* moved MAX_UNREWARDED_RELAYERS_IN_CONFIRMATION_TX and MAX_UNCONFIRMED_MESSAGES_IN_CONFIRMATION_TX to cumulus bridge primitives

* typo