feat: mini.files close on file open for l and enter

This reverts commit 9385589aeb.

plugins/ui.nix

@@ -11,6 +11,21 @@
       require("mini.icons").mock_nvim_web_devicons()
     '';
 
+    luaConfigRC.mini-files-close-on-open = ''
+      vim.api.nvim_create_autocmd("User", {
+        pattern = "MiniFilesBufferCreate",
+        callback = function(args)
+          local map = function(key)
+            vim.keymap.set("n", key, function()
+              MiniFiles.go_in({ close_on_file = true })
+            end, { buffer = args.data.buf_id })
+          end
+          map("l")
+          map("<CR>")
+        end,
+      })
+    '';
+
     binds.whichKey = {
       enable = true;
       setupOpts.delay = 300;