imp(ics-07): simplify `ClientType` impl in cw contract

[rnbguy]

Closes: #1201

Description

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PR author checklist:

• [ ] Added changelog entry, using unclog.
• [ ] Added tests.
• [ ] Linked to GitHub issue.
• [ ] Updated code comments and documentation (e.g., docs/).
• [ ] Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• [ ] Reviewed Files changed in the GitHub PR explorer.
• [ ] Manually tested (in case integration/unit/mock tests are absent).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 64.36%. Comparing base (87ec770) to head (a117a32). Report is 1 commits behind head on main.

Files	Patch %	Lines
...nts/ics07-tendermint/cw-contract/src/entrypoint.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1202 +/- ## ========================================== - Coverage 64.45% 64.36% -0.09% ========================================== Files 229 228 -1 Lines 22055 22001 -54 ========================================== - Hits 14215 14162 -53 + Misses 7840 7839 -1 ```

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