fix: accurately identify files within current working directory for MRU filtering (#459)

* Fix MRU Filtering Logic to Accurately Identify Files within CWD

* use `is_win`

* fix

Author: izumin5210

lua/dashboard/theme/hyper.lua

@@ -175,10 +175,12 @@ local function mru_list(config)
 
   if config.mru.cwd_only then
     local cwd = uv.cwd()
+    local sep = utils.is_win and '\\' or '/'
+    local cwd_with_sep = cwd .. sep
     mlist = vim.tbl_filter(function(file)
-      local file_dir = vim.fn.fnamemodify(file, ':p:h')
+      local file_dir = vim.fn.fnamemodify(file, ':p:h') .. sep
       if file_dir and cwd then
-        return file_dir:find(cwd, 1, true) == 1
+        return file_dir:sub(1, #cwd_with_sep) == cwd_with_sep
       end
     end, mlist)
   end