fix: oldfiles cwd_only that include backslashes (windows) (#820)

lua/telescope/builtin/internal.lua

@@ -251,6 +251,7 @@ internal.oldfiles = function(opts)
 
   if opts.cwd_only then
     local cwd = vim.loop.cwd()
+    cwd = cwd:gsub([[\]],[[\\]])
     results = vim.tbl_filter(function(file)
       return vim.fn.matchstrpos(file, cwd)[2] ~= -1
     end, results)