chore: clippy fix (#2408)

Author: TomAFrench

crates/noirc_frontend/src/lexer/lexer.rs

@@ -459,10 +459,7 @@ fn custom_attribute() {
     let mut lexer = Lexer::new(input);
 
     let token = lexer.next().unwrap().unwrap();
-    assert_eq!(
-        token.token(),
-        &Token::Attribute(Attribute::Custom("custom(hello)".to_string().into()))
-    );
+    assert_eq!(token.token(), &Token::Attribute(Attribute::Custom("custom(hello)".to_string())));
 }
 
 #[test]