optimize mempool Receive

[cwbhhjl]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #2323 (c658b7d) into dev (6a538b0) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #2323      +/-   ##
==========================================
- Coverage   36.33%   36.33%   -0.01%     
==========================================
  Files         415      415              
  Lines       43808    43808              
==========================================
- Hits        15918    15916       -2     
- Misses      26736    26737       +1     
- Partials     1154     1155       +1     

Impacted Files	Coverage Δ
x/wasm/keeper/keeper.go	80.39% <0.00%> (-0.31%)	:arrow_down:

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