Fix egregious thinko in eglot--uri-to-path

Fix egregious thinko in eglot--uri-to-path

One shouldn't unhex the URI before parsing it.  Just consider a
filename with a # character in it.  The character is encoded as C%23,
after unhexing the file name becomes.

  /tmp/C#/Program.cs

Now, parsing this as the URL will fail completely as the # mean
"anchor" in URLs.

* eglot.el (eglot--uri-to-path): Fix thinko.