docs(windows): update example config for nvim-tree (#2766)

utils/installer/config_win.example.lua

@@ -79,14 +79,14 @@ lvim.builtin.terminal.active = false
 -- lvim.builtin.terminal.shell = "pwsh.exe -NoLogo"
 
 -- nvim-tree has some performance issues on windows, see kyazdani42/nvim-tree.lua#549
-lvim.builtin.nvimtree.setup.diagnostics.enable = false
-lvim.builtin.nvimtree.setup.filters.custom = false
-lvim.builtin.nvimtree.setup.git.enable = false
-lvim.builtin.nvimtree.setup.update_cwd = false
-lvim.builtin.nvimtree.setup.update_focused_file.update_cwd = false
+lvim.builtin.nvimtree.setup.diagnostics.enable = nil
+lvim.builtin.nvimtree.setup.filters.custom = nil
+lvim.builtin.nvimtree.setup.git.enable = nil
+lvim.builtin.nvimtree.setup.update_cwd = nil
+lvim.builtin.nvimtree.setup.update_focused_file.update_cwd = nil
 lvim.builtin.nvimtree.setup.view.side = "left"
-lvim.builtin.nvimtree.setup.renderer.highlight_git = false
-lvim.builtin.nvimtree.setup.renderer.icons.show.git = false
+lvim.builtin.nvimtree.setup.renderer.highlight_git = nil
+lvim.builtin.nvimtree.setup.renderer.icons.show.git = nil
 
 -- if you don't want all the parsers change this to a table of the ones you want
 lvim.builtin.treesitter.ensure_installed = {