Test for contract address being a complex expression

[xunilrj]

Description

This PR improves tests for #6490. Now we have one contract test where the contract address comes from a complex expression.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
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• I have added tests that prove my fix is effective or that my feature works.
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