[neovim] set cursor back to underscore when nvim is closed

nix/home/neovim/neovim.nix

@@ -64,6 +64,14 @@
       vim.opt.smartindent = true
 
 
+      -- vim leave function
+      vim.api.nvim_create_autocmd({ "VimLeave" }, {
+	callback = function()
+	  vim.cmd('set guicursor=a:hor20-Cursor/lCursor')
+	end,
+      })
+
+
       -- load plugins
       -- neo-tree
       require("neo-tree").setup({