Revert "fix #1141"

This reverts commit c5bcf9d9a1.

lua/core/packer.lua

@@ -2,13 +2,11 @@ local M = {}
 
 M.bootstrap = function()
    local fn = vim.fn
-   local base_path = fn.stdpath "data" .. "/site/pack/packer"
-   local opt, start = base_path .. "/opt/packer.nvim", base_path .. "/start/packer.nvim"
-   local install_path = fn.isdirectory(opt) and opt or start
+   local install_path = fn.stdpath "data" .. "/site/pack/packer/start/packer.nvim"
 
    vim.api.nvim_set_hl(0, "NormalFloat", { bg = "#1e222a" })
 
-   if not fn.isdirectory(install_path) then
+   if fn.empty(fn.glob(install_path)) > 0 then
       print "Cloning packer .."
 
       fn.system { "git", "clone", "--depth", "1", "https://github.com/wbthomason/packer.nvim", install_path }