luci_config: Reformat tests

Change-Id: I06cff3d3fe047dc853edd356d540a4add4ee6699
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/229083
Reviewed-by: Danielle Kay <danikay@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/recipes/luci_config.py b/recipes/luci_config.py
index fa62818..72e9f6e 100644
--- a/recipes/luci_config.py
+++ b/recipes/luci_config.py
@@ -41,9 +41,9 @@
         props.validate_lucicfg_options.CopyFrom(api.validate_lucicfg.options())
         return api.properties(props)
 
-    yield (
-        api.test('starlark')
-        + properties()
-        + api.checkout.try_test_data()
-        + api.post_process(post_process.DropExpectation)
+    yield api.test(
+        'starlark',
+        properties(),
+        api.checkout.try_test_data(),
+        api.post_process(post_process.DropExpectation),
     )