vim-patch:8.2.2452: no completion for the 'filetype' option

Problem:    No completion for the 'filetype' option.
Solution:   Add filetype completion. (Martin Tournoij, closes vim/vim#7747)
d5e8c92816

src/nvim/options.lua

@@ -900,6 +900,7 @@ return {
       normal_fname_chars=true,
       vi_def=true,
       alloced=true,
+      expand=true,
       varname='p_ft',
       defaults={if_true={vi=""}}
     },