fix nonsense transaction protobuf serde issue with send money

[azban]

No description provided.

[azban]

the issue arose because we weren't actually making good assertions in test_rpc_cli. in this case, we were just checking that you could submit a transaction. to properly test this, we will need to create an account, send money to the account and then view the account to check the balance.

@nearmax, have you been thinking about fixtures for integration testing? i'm inclined to set up everything explicitly in each test, and then extract out later, but at some point it would be good if we had a fixtures framework (chainspec would be useful for this use case), so that we could test sending money in isolation, without having to go through the motions of creating accounts (for the sake of efficiency and complexity)

[MaksymZavershynskyi]

Yes, I have investigated fixtures and parametrized tests in rust, and I have a complete understanding of how we can do it in a nice way. However, I did not have time implementing it. We can discuss it whenever you have time.

[MaksymZavershynskyi]

Ok for now, but we should brush up our integration tests later, as discussed.