test(sdk): Fix an integration test in Sliding Sync.

The test does the following:

1. Create 2 (identical) lists,
2. Do a sync.
3. Assert that the 1st and 2nd lists are receiving an update,
4. Add a 3rd (identical) list,
5. Do a new sync,
6. Assert that 3rd list is receiving an update.

This last step is wrong. All lists should receive an update as they
are identical.

testing/sliding-sync-integration-test/src/lib.rs

@@ -360,7 +360,7 @@ async fn adding_list_later() -> anyhow::Result<()> {
         // we only heard about the ones we had asked for
         if !summary.lists.is_empty() {
             // only if we saw an update come through
-            assert_eq!(summary.lists, [list_name_3]);
+            assert_eq!(summary.lists, [list_name_1, list_name_2, list_name_3]);
             // we didn't update the other lists, so only no 2 should se an update
             saw_update = true;
             break;