bug#58843: Print "decrypted" rot13 text is buffer is read-only

[Eli Zaretskii]

> From: Philip Kaludercic <philipk@posteo.net>
> Date: Fri, 28 Oct 2022 18:24:58 +0000
> 
> Tags: patch
> 
> 
> When someone sends you rot13'ed text but the buffer is read-only, it
> seems the next best thing one can do is to print the decrypted text.  I
> don't think it makes sense in general for `translate-region' to do the
> same, so I just modified the code in rot13.el.

Thanks, but I see no patch in your message.  I see a complete rot13.el
file.