Not compute correctly WETH unlock value when WETH is the base

[JoaoCampos89]

On Weth related to stable coins, it is normal to use Weth as the base. The getWrapEthStepIfNeeded does not handle these cases when WETH is used as base. My workaround was:

Create an isQuote flag and then on the step:

let wethAmountNeeded = isQuote ? amount.multipliedBy(price) : amount;

Before calling the step we need to check if Weth is the quote or base, could be used the following function:

const isWethQuote = isWeth(quoteToken.symbol.toLowerCase()) ? true : false;

At the moment I recommend warning users about this issue saying Weth is not supported as a base token on the config.