zsh: Fix _LP_DIR_SYMBOL (#433)
zsh: Fix _LP_DIR_SYMBOL (#433)

Fix _LP_DIR_SYMBOL that is used when LP_PATH_KEEP=-1 and
LP_SHORTEN_PATH=1

joshuarubin/dotfiles,joshuarubin/dotfiles,joshuarubin/dotfiles,nojhan/liquidprompt,milouse/liquidprompt,smadhueagle/liquidprompt,dan-cleinmark/liquidprompt,joshuarubin/dotfiles,pkkolos/liquidprompt,alexprengere/liquidprompt,BobHood/liquidprompt,laurentbardin/liquidprompt,jaesivsm/liquidprompt,tsbarnes/liquidprompt,dpilone/liquidprompt,dtschan/liquidprompt