fix: use explicit buf inside schedule callback

Author: thedaviddelta

lua/nvim-tree.lua

@@ -408,7 +408,8 @@ local function setup_autocommands(opts)
       pattern = "NvimTree_*",
       callback = function()
         vim.schedule(function()
-          vim.api.nvim_buf_call(0, function()
+          local bufnr = vim.api.nvim_get_current_buf()
+          vim.api.nvim_buf_call(bufnr, function()
             vim.cmd [[norm! zz]]
           end)
         end)