fix(x/group): proper address rendering in error (backport #22425)

[mergify]

Description

Closes: #22414

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Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for unauthorized message signers, enhancing clarity in error messages.
  • Updated error reporting to provide a meaningful output even when address conversion fails.

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This is an automatic backport of pull request #22425 done by [Mergify](https://mergify.com).

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[github-actions]

@mergify[bot] your pull request is missing a changelog!