Problem: validation broke after transaction conversion with raw field

[mmsqe]

Closes: #XXX

Description

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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

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 46.56%. Comparing base (c4cef0f) to head (7e402e3).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
x/evm/types/eth.go	30.00%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #536   +/-   ##
========================================
  Coverage    46.56%   46.56%           
========================================
  Files          181      181           
  Lines        14506    14512    +6     
========================================
+ Hits          6754     6758    +4     
- Misses        7037     7040    +3     
+ Partials       715      714    -1     

Files with missing lines	Coverage Δ
x/evm/types/msg.go	60.21% <ø> (ø)
x/evm/types/eth.go	48.07% <30.00%> (+2.42%)	⬆️

[yihuang]

chain-id validation seems unnecessary, otherwise LGTM.