ChanOpenConfirm fix

[plafer]

Closes: #353

Note that #352 also fixes this already in the new validate().

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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]

Codecov Report

Base: 61.01% // Head: 61.01% // No change to project coverage 👍

Coverage data is based on head (8fc9b22) compared to base (3ed2246).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #354   +/-   ##
=======================================
  Coverage   61.01%   61.01%           
=======================================
  Files         124      124           
  Lines       14498    14498           
=======================================
  Hits         8846     8846           
  Misses       5652     5652           

Impacted Files	Coverage Δ
...rc/core/ics04_channel/handler/chan_open_confirm.rs	83.72% <100.00%> (ø)

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[Farhad-Shabani]

🙏
Should we patch this for our recent release? v0.26.1?

[plafer]

Yes I'll do one on Monday