fix(pwdx): fix use of _parse_help

Author: akinomyoga

completions/pwdx

@@ -12,9 +12,9 @@ _comp_cmd_pwdx()
     esac
 
     if [[ $cur == -* ]]; then
-        local help='$(_parse_help "$1")'
+        local help=$(_parse_help "$1")
         [[ $help ]] || help=-V
-        COMPREPLY=($(compgen -W "$help" -- "$cur"))
+        COMPREPLY=($(compgen -W '$help' -- "$cur"))
     else
         _pids
     fi