Fix difficulty calc for rpc display
Fix difficulty calc for rpc display

MaxGuevara/quark,MaxGuevara/quark,zurcoin/zurcoin,MaxGuevara/quark,quark-project/quark,quark-project/quark,zurcoin/zurcoin,quark-project/quark,MaxGuevara/quark,zurcoin/zurcoin,zurcoin/zurcoin,quark-project/quark,MaxGuevara/quark,zurcoin/zurcoin,MaxGuevara/quark,quark-project/quark,quark-project/quark,zurcoin/zurcoin