refactor: use vim.ui.input for y/n selections

also add clear_prompt again.
fixes #1441

lua/nvim-tree/utils.lua

@@ -373,4 +373,10 @@ function M.get_win_buf_from_path(path)
   return nil, nil
 end
 
+function M.clear_prompt()
+  if vim.opt.cmdheight._value ~= 0 then
+    vim.cmd "normal! :"
+  end
+end
+
 return M