fix pruned node integration test

[yihuang]

Description

closes: #1222

Integration tests to be added in: #1212

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For contributor use:

• 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.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #1223 (76cde5e) into main (642da0c) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1223      +/-   ##
==========================================
- Coverage   57.22%   57.19%   -0.04%     
==========================================
  Files          94       94              
  Lines        8398     8399       +1     
==========================================
- Hits         4806     4804       -2     
- Misses       3349     3351       +2     
- Partials      243      244       +1     

Impacted Files	Coverage Δ
rpc/backend/evm_backend.go	24.19% <100.00%> (-0.32%)	⬇️