Do not set bucketed_triggers for trunk builders.

A generator ensures that all builders for bucket ci that have an
associated scheduler job actually have a scheduler job both with and
without the ci prefix, so it's unnecessary for it to be set for builders
in the ci bucket. Not setting it means that we won't unnecessarily add
the property to builders when we move builders from master-only/ci.star.

Bug: 1119446
Change-Id: I2575cb34f3f9ac97dce30545dafbe40e5ff96cc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378717Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801993}

infra/config/subprojects/chromium/ci.star

@@ -13,7 +13,6 @@ def main_console_if_on_branch():
 ci.set_defaults(
     settings,
     add_to_console_view = True,
-    bucketed_triggers = settings.is_master,
     main_console_view = None if settings.is_master else settings.main_console_name,
     cq_mirrors_console_view = settings.cq_mirrors_console_name,
 )