AllowedMsgAllowance does not subtract fees from spend_limit

[0Tech]

Summary of Bug

AllowedMsgAllowance does not subtract the fees from spend_limit. The granter pays the fee correctly, and the module checks spend_limit so if the requested amount of fee is greater than the limit, it rejects the transaction. However, after the transaction, spend_limit, which should have been subtracted by the amount of fee, is intact.

I found the same issue on cosmos-sdk too.

Version

bc28e49

Steps to Reproduce

$ simd tx feegrant grant $granter $grantee --spend-limit $limit --allowed-messages "/lbm.bank.v1.MsgSend"
$ simd query feegrant grants $grantee // remember spend_limit
$ simd tx bank send $grantee $other $sendamount --fee-account $granter --fees $fee
$ simd query feegrant grants $grantee // spend_limit has not decreased

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[0Tech]

I opened the issue on cosmos-sdk.
cosmos/cosmos-sdk#10563