fix(pb): protocol buffer file syntax compatibility issue

[wifiwang777]

What does this PR do?
fix

Why are these changes required?
I can't compile protocol buffer file

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[lxcmyf]

@wifiwang777
Are you saying that writing 'x' in uppercase before would cause your project to fail to compile? Please let me know how you did it? Under what circumstances will compilation fail?

[wifiwang777]

@wifiwang777 Are you saying that writing 'x' in uppercase before would cause your project to fail to compile? Please let me know how you did it? Under what circumstances will compilation fail?

I imported the pb file into Postman and encountered an error when testing the GRPC request.

[lxcmyf]

@wifiwang777
You can first use the PB protocol here: https://github.com/tronprotocol/protocol
This PR will also be included in the future. Thank you for your correction.

[Sunny6889]

good job to fix it.