nvim: add filetype to modeline, remove fileencoding

.config/nvim/lua/my/functions.lua

@@ -38,11 +38,11 @@ function M.insert_modeline()
 
     local modeline_elements = {
         ' vim: set',
-        ' fenc=' .. fenc,
         ' ts=' .. vim.o.tabstop,
         ' sw=' .. vim.o.shiftwidth,
         (vim.o.expandtab and ' et' or ' noet'),
         ' tw=' .. vim.o.textwidth,
+        ' ft=' .. vim.o.filetype,
         ':',
         space_maybe
     }