Fix clippy::useless_conversion

src/client_server/push.rs

@@ -95,7 +95,7 @@ pub async fn get_pushrule_route(
     if let Some(rule) = rule {
         Ok(get_pushrule::Response { rule }.into())
     } else {
-        Err(Error::BadRequest(ErrorKind::NotFound, "Push rule not found.").into())
+        Err(Error::BadRequest(ErrorKind::NotFound, "Push rule not found."))
     }
 }