fix: Correctly populate legacy Vote.Option field

[amaury1093]

Description

Manually tested.

Before:

./build/simd q gov votes 1
pagination:
  next_key: null
  total: "0"
votes:
- option: VOTE_OPTION_UNSPECIFIED
  options:
  - option: VOTE_OPTION_YES
    weight: "1.000000000000000000"
  proposal_id: "1"
  voter: cosmos137kdgzutlhnqk0t4et7g45ghl5vxupxvl09wct

After:

./build/simd q gov votes 1
pagination:
  next_key: null
  total: "0"
votes:
- option: VOTE_OPTION_YES
  options:
  - option: VOTE_OPTION_YES
    weight: "1.000000000000000000"
  proposal_id: "1"
  voter: cosmos137kdgzutlhnqk0t4et7g45ghl5vxupxvl09wct

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #9583 (bb95afa) into master (7679820) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #9583   +/-   ##
=======================================
  Coverage   60.70%   60.70%           
=======================================
  Files         588      588           
  Lines       37277    37278    +1     
=======================================
+ Hits        22628    22629    +1     
  Misses      12699    12699           
  Partials     1950     1950           

Impacted Files	Coverage Δ
x/gov/keeper/grpc_query.go	75.00% <100.00%> (+0.18%)	⬆️

[ryanchristo]

LGTM