[eth-json-rpc-middleware] fix: remove condition to allow 'cosmos' as valid value for verifyingContract field in typed signatures #6871
Description
We have added code to allow cosmos as valid verifyingContract value for typed signatures. The reason for this is to keep support signature signing on cosmos network.
A lot of cosmos dapps use this deprecated sdk with hard coded value of verifyingContract: https://github.com/evmos/ethermint/blob/main/ethereum/eip712/domain.go#L29
Once users stop using this SDK we can remove this hard coded condition.