fix(ics04): packet receive event type identifier

[penso]

Closes: #1180

Description

Followup speaking with @rnbguy about a wrong event name I noticed while looking at optionally using ibc-rs for my Cosmos indexer, so it matches the go implementation

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PR author checklist:

• [x] Added changelog entry, using unclog.
• [ ] Added tests.
• [x] 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).

[rnbguy]

Related to #374