fix: conform-nvim option change

config/lsp/conform.nix

@@ -1,14 +1,21 @@
-{ helpers, pkgs, ... }: {
+{ helpers, pkgs, ... }:
+{
   plugins.conform-nvim = {
     enable = true;
-    formatAfterSave = ''
-      {
-        format_after_save = {
-          lsp_format = "fallback",
-        },
-      }
+    format_after_save = ''
+      function(bufnr)
+        if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
+          return
+        end
+
+        if not slow_format_filetypes[vim.bo[bufnr].filetype] then
+          return
+        end
+
+        return { lsp_fallback = true }
+      end
     '';
-    formattersByFt = {
+    formatters_by_ft = {
       python = [ "black" ];
       c = [ "clang-format" ];
       cpp = [ "clang-format" ];