[migrate] Bond Slash Refunds

Ursa (9R)requested to merge
ursa/migrate-slash-refund into develop

This refunds the bond slashes from the double spend observed in the transaction https://thornode-v2.ninerealms.com/cosmos/tx/v1beta1/txs/07928DF781C7B0A930D5559265CBC4B4A4D5E7A96139ACFC9D26A2007C11C679.

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