chore: revert storage change

[huaweigu]

Summary

So it'd make the migration easy. For more details, please refer to natspec.

Detail

Changeset

• reverted one change from the previous PR

Checklist

• Did you add new tests and confirm all tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the docs folder)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint) and fix any issues?
• Did you run formatter (yarn format:check) and fix any issues (yarn format:write)?

Testing

• test has also been reverted

Documentation

• see natspec