util: Stop calling api.buildbucket.build_url()

This is being removed.

Change-Id: Idf6244262b9c5accebdde488bc86c1c037c20832
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/242992
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/recipe_modules/util/api.py b/recipe_modules/util/api.py
index 0f88aa4..21fbac5 100644
--- a/recipe_modules/util/api.py
+++ b/recipe_modules/util/api.py
@@ -124,7 +124,7 @@
             'bb_id': self.m.buildbucket.build.id,
             'swarming_id': self.m.swarming.task_id,
             'builder': self.m.buildbucket_util.full_builder_name(),
-            'url': self.m.buildbucket_util.build_url,
+            'url': self.m.buildbucket.build_url(),
             'triggers': [
                 json.loads(json_format.MessageToJson(x))
                 for x in self.m.scheduler.triggers