languages/r: removing toggle for wrappers

modules/plugins/languages/r.nix

@@ -20,20 +20,6 @@
 
   defaultFormat = "format_r";
   formats = {
-    prettier = {
-      package = pkgs.nodePackages.prettier;
-      nullConfig = ''
-        local prettier = null_ls.builtins.formatting.prettier.with({
-          filetypes = { "r" },
-          extra_args = {
-            "--plugin", "prettier-plugin-r",
-            "--parser", "r"
-          }
-        })
-        table.insert(ls_sources, prettier)
-      '';
-    };
-
     styler = {
       package = pkgs.rWrapper.override {
         packages = with pkgs.rPackages; [styler];