Re-enable Li.Fi same-chain swaps for Optimism

[gomesalexandre]

Overview

Same-chain Optimism Li.Fi swaps were disabled in #4919 with the rationale below:

web/packages/swapper/src/swappers/LifiSwapper/LifiSwapper.ts

Lines 27 to 31 in f5b155b

	// TODO(gomes): This is weird but a temporary product compromise to accommodate for the fact that OP rewards have weird heuristics
	// and would detect same-chain swaps on Li.Fi as cross-chain swaps, making the rewards gameable by same-chain swaps
	// Remove me when OP rewards ends
	...filterSameChainEvmBuyAssetsBySellAssetId(input).filter(
	asset => asset.chainId !== optimismChainId,

However, that campaign is long finished, so we should be able to re-enable these

References and additional details

See #4919 for historical context

Acceptance Criteria

Same-chain Optimism swaps Li.Fi swaps are enabled

Need By Date

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Screenshots/Mockups

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Estimated effort

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