fix: Fix raw_log when ABCIMessageLog.MsgIndex is 0 (#11147)

This will make sure `raw_log` always shows `msg_index`, and not just when it's 1 or above.



## Description

Closes: #XXXX



---

### Author Checklist

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- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
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I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
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- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

proto/cosmos/base/abci/v1beta1/abci.proto

@@ -52,7 +52,7 @@ message TxResponse {
 message ABCIMessageLog {
   option (gogoproto.stringer) = true;
 
-  uint32 msg_index = 1;
+  uint32 msg_index = 1 [(gogoproto.jsontag) = "msg_index"];
   string log       = 2;
 
   // Events contains a slice of Event objects that were emitted during some