revert getdifficulty change which is visual diff
revert getdifficulty change which is visual diff

this broke tests and is only to show diff through cli commands, not consensus critical


Former-commit-id: ef08193238158d151733882b15ef0f07d452e57c
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin