fix return type for syscoingetspvproof
fix return type for syscoingetspvproof

this call will crash rpc server as it was the wrong type so we fix it to any type as it really is an object of mixed collection of fields

syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin