nvim: run a formatted and update autocmds to new 0.7 api

.config/nvim/lua/plugins/nvim-tree.lua

@@ -1,9 +1,13 @@
 -- nvim tree
-require'nvim-tree'.setup{
+require("nvim-tree").setup({
 	update_cwd = true,
 	diagnostics = {
 		enable = true,
 	},
-}
+})
 
-vim.cmd("autocmd BufEnter * ++nested if winnr('$') == 1 && bufname() == 'NvimTree_' . tabpagenr() | quit | endif")
+-- close tab/vim when nvim-tree is the last window in the tab
+vim.api.nvim_create_autocmd("BufEnter", {
+	pattern = "*",
+	command = "if winnr('$') == 1 && bufname() == 'NvimTree_' . tabpagenr() | quit | endif",
+})