test(evm): add missing db coverage

[oXtxNt9U]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

❌ Patch coverage is 99.58027% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.98%. Comparing base (9b7c2af) to head (d013c41).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/evm/bindings/src/lib.rs	0.00%	2 Missing ⚠️
packages/evm/core/src/db.rs	99.78%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1273      +/-   ##
===========================================
+ Coverage    53.85%   54.98%   +1.13%     
===========================================
  Files         1128     1131       +3     
  Lines        64182    65190    +1008     
  Branches      1724     1801      +77     
===========================================
+ Hits         34564    35846    +1282     
+ Misses       29325    29049     -276     
- Partials       293      295       +2     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	54.69% <99.58%> (+0.84%)	⬆️

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