style: use Self to avoid unnecessary repetition (#3396)

axum-extra/src/extract/query.rs

@@ -91,7 +91,7 @@ where
             serde_html_form::Deserializer::new(form_urlencoded::parse(query.as_bytes()));
         let value = serde_path_to_error::deserialize(deserializer)
             .map_err(FailedToDeserializeQueryString::from_err)?;
-        Ok(Query(value))
+        Ok(Self(value))
     }
 }
 
@@ -170,9 +170,9 @@ where
                 serde_html_form::Deserializer::new(form_urlencoded::parse(query.as_bytes()));
             let value = serde_path_to_error::deserialize(deserializer)
                 .map_err(FailedToDeserializeQueryString::from_err)?;
-            Ok(OptionalQuery(Some(value)))
+            Ok(Self(Some(value)))
         } else {
-            Ok(OptionalQuery(None))
+            Ok(Self(None))
         }
     }
 }