luafilesystem broken

I installed the luafilesystem addon, but no completion came even in files with `require "lfs"`. I tried reinstalling it and playing with the `words` in config.json but nothing helped.

I do notice every time I open the addon manager, there's a brief moment where luafilesystem is not shown as installed.

Reproduce the missing completion for files containing `require "lfs"`, and observe the addon manager while opening it. Inspect the addon state and the `words` configuration mentioned in the report; done means luafilesystem stays shown as installed and completion is available.

Written by the indexing model from the issue text.