Remove redundant CFeeRate in Amount.h
Remove redundant CFeeRate in Amount.h

Solved conflict where upstream moved CFeeRate into ./policy/

Credit: https://github.com/dogecoin/dogecoin/pull/2497
goldcoin/goldcoin,goldcoin/goldcoin,goldcoin/goldcoin,goldcoin/goldcoin,goldcoin/goldcoin,goldcoin/goldcoin