www: do not unecessarily escape some chars in paths

www: do not unecessarily escape some chars in paths

Based on reading RFC 3986, it seems '@', ':', '!', '$', '&',
"'", '; '(', ')', '*', '+', ',', ';', '=' are all allowed
in path-absolute where we have the Message-ID.

In any case, it seems '@' is fairly common in path components
nowadays and too common in Message-IDs.