parsers: clippy pass

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

parsers/src/muc/user.rs

@@ -271,6 +271,12 @@ generate_element!(
     ]
 );
 
+impl Default for MucUser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MucUser {
     /// Creates an empty MucUser
     pub fn new() -> MucUser {