Add regression test for protocol config state after re-initialization attempt

[Chucks1093]

Summary
If initialize is called a second time after the protocol is already configured, the contract should reject it cleanly. A regression test for this path confirms the guard holds and the existing config is not overwritten.

Scope

• add a test that calls initialize on an already-initialized contract
• assert the call is rejected with the expected error variant
• assert the existing protocol config fields are unchanged after the rejected call

Acceptance Criteria

• a second initialize call is rejected with the correct error
• the existing protocol config is intact after the rejected call
• the test uses the standard contract test setup helper

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[razeprasine]

@razeprasine has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi Maintainer, I will love to fix this issue

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This issue has been completed by @razeprasine as part of the Stellar Wave Program's 5th Wave 🥳

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