home: vim: remove 'fastfold' configuration

I missed it in the original commit that removed the plug-in from my
configuration...

modules/home/vim/plugin/settings/fastfold.lua

@@ -1,5 +0,0 @@
--- Intercept all fold commands
--- stylua: ignore
-vim.g.fastfold_fold_command_suffixes = {
-    "x", "X", "a", "A", "o", "O", "c", "C", "r", "R", "m", "M", "i", "n", "N",
-}