fix(x/tx): don't shadow Amino marshalling error messages (backport #19955)

[mergify]

Description

A minor thing but it took me a while to figure out where the problem was when marshalling a message of mine.

The error (trimmed for readability) was:

cannot marshal response pagination:{total:1} [...]: unexpected end of JSON input

While digging in the code I found that the real Amino error was not being considered, and buf.Bytes() was being tried to use anyway, but only when indenting the response.

In fact, after trying the same query from CLI with --no-indent, I got the real error:

cannot marshal response pagination:{total:1} [...]: field identifier within a oneof must have the amino.oneof_type_name option set

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Summary by CodeRabbit

• Bug Fixes
  • Improved error handling in transactions to ensure clearer error messages are displayed, enhancing user experience during transaction processing.

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This is an automatic backport of pull request #19955 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 15ad85d has failed:

On branch mergify/bp/release/v0.50.x/pr-19955
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit 15ad85d4e.
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	both modified:   x/tx/CHANGELOG.md

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