fix event type name to "setDestinationChain"

[enemycnt]

Description

Related Issue Or Context

Closes: #242

How Has This Been Tested? Testing details.

Create only two networks in the public/chainbridge-runtime-config.js

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in chainbridge-docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot

[render]

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