Calling `pause()` when already paused emits redundant event in settlement

[therealjhay]

Files: settlement_contract/src/lib.rs:278-301

Problem: If pause() is called when the contract is already paused, it writes true to storage (same value) and emits a pause event. This produces a misleading event stream showing two consecutive pause events with no intervening unpause. Off-chain indexers may misinterpret this as a double-pause or missed unpause.

Fix: Add a redundant-pause guard (see Issue 10). Emit a warning or explicitly document in the event docstring that duplicate pause events should be ignored by indexers if the guard is not added.

[Silver36-ship-it]

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[Gozirimdev]

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[amosleoamadi]

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[flexocode442]

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[Dochedave]

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