refactor(protoc-gen-pony): remove mapValuePonyType duplicate of elemPonyType

[enilsen16]

Summary

• mapValuePonyType was identical to elemPonyType in every branch (MessageKind, EnumKind, scalar default). Removed the duplicate and replaced all 4 call sites with elemPonyType.
• Dropped the redundant doc comment on isWKT — the wktBlocklist var comment directly above it already explains the reasoning in full.

Test plan

• go test ./cmd/protoc-gen-pony/ — all 36 tests pass (no behavior change)

[cursor]

PR Summary

Low Risk
Pure refactor of code-generation helpers with no expected behavior change; limited to type-string construction and comments.

Overview
Simplifies Pony protobuf code generation by removing the duplicated mapValuePonyType helper and switching map value type resolution in decode/type/default emission (emitDecode, emitMapDecodeArm, fieldPonyType, fieldPonyDefault) to reuse elemPonyType.

Also drops a redundant doc comment above isWKT, relying on the existing wktBlocklist comment for explanation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: c9dd0974-cc6e-414b-8cd2-7eb18a543314

📥 Commits

Reviewing files that changed from the base of the PR and between 6cc7882 and 49dd0ab.

📒 Files selected for processing (1)

• cmd/protoc-gen-pony/generate.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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