fix : removed the unnecessary usage of ErrInvalidMsg (backport #1311)

[mergify]

This is an automatic backport of pull request #1311 done by Mergify.
Cherry-pick of 4c906d5 has failed:

On branch mergify/bp/releases/v0.3x/pr-1311
Your branch is up to date with 'origin/releases/v0.3x'.

You are currently cherry-picking commit 4c906d5a.
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Unmerged paths:
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	both modified:   x/wasm/types/tx.go

no changes added to commit (use "git add" and/or "git commit -a")

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[codecov]

Codecov Report

Merging #1317 (a249a6d) into releases/v0.3x (d48bb69) will not change coverage.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           releases/v0.3x    #1317   +/-   ##
===============================================
  Coverage           57.49%   57.49%           
===============================================
  Files                  55       55           
  Lines                7460     7460           
===============================================
  Hits                 4289     4289           
  Misses               2865     2865           
  Partials              306      306           

Impacted Files	Coverage Δ
x/wasm/types/tx.go	48.24% <100.00%> (ø)