small improvement of "open latest"

It is not super important, but it would be nice if the recent files list also included this:

I opened a file, used "save as" to save it under a new name, made some changes, saved and closed.

Next time I opened MacVim, the latest files list only contained the original name, not the name I gave it with "save as".

Thank you for maintaining MacVim, it is a great tool for me!

Best regards, Hans Jørgen.

首先在 MacVim 中重现报告的操作序列：打开一个文件，使用 Save As，编辑并以新名称保存，关闭 MacVim，然后重新打开并检查最近文件列表。当新保存的名称与原名称一起出现在列表中，或出现在原名称的位置时，即表示完成。