misspelling variable name
Created by: liujoey
typeset _LP_ENABLE_DETACHED_SESSION here, but used _LP_ENABLE_DETACHED_SESSIONS elsewhere.
And typeset should have -x option, otherwise the _LP_ENABLE_SCREEN and _LP_ENABLE_TMUX value is not visible in function _lp_jobcount_color(). At least on my Mac OS Mojave, i have to add -x to the typeset to make this function work.