`globset` does not match non-ascii in character class

[Dav1dde]

The following code fails the assertion, where I would expect it to succeed.

assert!(globset::Glob::new("[ඞ]").unwrap().compile_matcher().is_match("ඞ"));

The problem appears to be the escaping here:

ripgrep/crates/globset/src/glob.rs

Line 701 in af8c386

re.push_str(&char_to_escaped_literal(r.0));

I can PR this and remove the escaping if you think this is the correct fix. Although some escaping would still be necessary, for example for the pattern [\\], the \ still needs to be escaped.