fix: Invalid variant active_bids should be activate_bids

[davidvuong]

The message fabrication for activateBids is incorrect. This PR renames active_bids to activate_bids. The following error occurs when trying to broadcast the malformed message:

failed to execute message; message index: 0: Error parsing into type moneymarket::liquidation_queue::ExecuteMsg: unknown variant `active_bids`, expected one of `receive`, `update_config`, `whitelist_collateral`, `update_collateral_info`, `submit_bid`, `retract_bid`, `activate_bids`, `claim_liquidation`

Documentation: https://docs.anchorprotocol.com/smart-contracts/liquidations/liquidation-queue-contract#activatebids

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