chore: Remove unnecessary Number conversion for dstChain

[barajeel]

Noticed that config.dstChain was being wrapped with Number(), but this conversion isn't needed. If dstChain is already a string (e.g., a network identifier), there's no reason to cast it.

The check now correctly logs the value as it is, making the code more consistent with how src and l1 chains are handled.

[cb-heimdall]

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