codegen: remove the double quote
oh another issue from my latest PR
@@ -287,7 +287,7 @@ impl {}Builder {{
writeln!(
w,
r#" let ret = {}::Object::new::<{}>(&properties)
- .expect("Failed to create an instance of {}"");"#,
+ .expect("Failed to create an instance of {}");"#,
glib_crate_name, analysis.name, analysis.name,
)?;
writeln!(w, " {{\n {}\n }}", code)?;
