Fix tree refreshing logic (#739)

Author: yehy4

lua/nvim-tree/lib.lua

@@ -197,9 +197,7 @@ function M.refresh_tree(disable_clock)
     M.Tree.loaded = false
   end
 
-  if not disable_clock then
-    vim.defer_fn(function() refreshing = false end, vim.g.nvim_tree_refresh_wait or 1000)
-  end
+  vim.defer_fn(function() refreshing = false end, vim.g.nvim_tree_refresh_wait or 1000)
 end
 
 function M.set_index_and_redraw(fname)