Enable WETH & ETH Donations In Same Checkout

[apbendi]

A limitation that results from this is you can't donate WETH and ETH in the same transaction, which I think is an edge case that's ok if we don't support. Wonder if Uniswap V3 router would let you multicall an ETH->DAI and WETH->DAI swap in the same transaction. My guess it supports that via multicall where you deposit ETH->WETH in the router as the first call, then execute the swap as the next call.

-- @mds1

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