nvim: after/ftplugin/rust: Remove format on save

Formatting on save tends to go completely wrong sometimes for some
reason. Just remove it.

nvim/.config/nvim/after/ftplugin/rust.lua

@@ -12,13 +12,6 @@ vim.keymap.set('n', 'cbd', ":Dispatch! cargo doc<CR>"       , { noremap=true, bu
 vim.keymap.set('n', 'cdD', ":Dispatch! cargo doc --open<CR>", { noremap=true, buffer=0 })
 vim.keymap.set('n', 'cbu', ":Dispatch! cargo update<CR>"    , { noremap=true, buffer=0 })
 
-vim.api.nvim_create_autocmd({ "BufWritePre" }, {
-  buffer   = 0,
-  callback = function()
-    vim.lsp.buf.format({async=true})
-  end,
-})
-
 vim.api.nvim_create_autocmd({ "BufReadPre", "BufWinEnter" }, {
   pattern  = { "*/git/checkouts/*", "*/toolchains/*", "*cargo/registry/*" },
   callback = function()