Hotfix v1.10.3 - Quote endpoint & native currency fix

Price endpoint /quote needed to be tweaked to properly deal with native currencies (ETH on Ethereum, XDAI on Gnosis Chain, etc)

Changelog

git log --oneline --no-decorate v1.10.2...HEAD 028293a52 1.10.3 4e67235b2 check buyToken address and set to native