Fix misleading comment in Sonic fixture

[Copilot]

Addresses review feedback on #2800: comment at _fixture-sonic.js:326 incorrectly described the operation as "Add ETH to the Metapool" when it actually deposits wS (Wrapped S) to a Sonic SwapX AMO strategy.

• contracts/test/_fixture-sonic.js: Updated comment to accurately read "Add wS (Wrapped S) to a Sonic SwapX pool"

Code Change Checklist

To be completed before internal review begins:

• The contract code is complete
• Executable deployment file
• Fork tests that test after the deployment file runs
• Unit tests *if needed
• The owner has done a full checklist review of the code + tests

Internal review:

• Two approvals by internal reviewers

Deploy checklist

Two reviewers complete the following checklist:

- [ ] All deployed contracts are listed in the deploy PR's description
- [ ] Deployed contract's verified code (and all dependencies) match the code in master
- [ ] Contract constructors have correct arguments
- [ ] The transactions that interacted with the newly deployed contract match the deploy script.
- [ ] Governance proposal matches the deploy script
- [ ] Smoke tests pass after fork test execution of the governance proposal

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[naddison36]

There are no code changes