parsers: derive Default for ibr::LegacyQuery

Very useful when composing a query.

parsers/ChangeLog

@@ -12,6 +12,8 @@ XXXX-YY-ZZ RELEASER <admin@example.com>
     * Improvements:
         - Make Priority’s inner i8 pub, which had been broken since the
           conversion to xso. (!632)
+        - ibr::LegacyQuery now implements Default, allowing users to more
+          easily construct it (!660)
 
 Version 0.22.0:
 2025-10-28 pep <pep@bouah.net>

parsers/src/ibr.rs

@@ -30,7 +30,7 @@ pub struct RemoveQuery {
 impl IqSetPayload for RemoveQuery {}
 
 /// Query for registering against a service, the legacy way.
-#[derive(FromXml, AsXml, Debug, Clone)]
+#[derive(FromXml, AsXml, Debug, Clone, Default)]
 #[xml(namespace = ns::REGISTER, name = "query")]
 pub struct LegacyQuery {
     /// Whether this account is already registered