chore(evm): cleanup EVM files

[fedekunze]

Description

Minor maintenance cleanup of functions within the EVM

---

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

---

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 #1582 (dbc29d1) into main (17343e6) will increase coverage by 0.00%.
The diff coverage is 90.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1582   +/-   ##
=======================================
  Coverage   68.65%   68.65%           
=======================================
  Files         103      105    +2     
  Lines        9953     9954    +1     
=======================================
+ Hits         6833     6834    +1     
  Misses       2737     2737           
  Partials      383      383           

Impacted Files	Coverage Δ
x/evm/keeper/grpc_query.go	85.90% <ø> (ø)
x/evm/statedb/config.go	100.00% <ø> (ø)
x/evm/keeper/state_transition.go	78.29% <57.14%> (-3.71%)	⬇️
x/evm/keeper/gas.go	89.47% <89.47%> (ø)
x/evm/keeper/config.go	92.10% <92.10%> (ø)
app/ante/eth.go	80.08% <100.00%> (+0.08%)	⬆️
x/evm/keeper/utils.go	85.71% <100.00%> (+3.74%)	⬆️