Populate refs for console view

The console view is currently broken [1] with an error that seems
incorrect:

"incorrect repo URL "https://gerrit.googlesource.com/luci-test" in the
config or no access"

The docs [2] say that refs will default to ["refs/heads/main"] anyway,
but I see other hosts setting it. I would like to see if this fixes the
console view.

[1] https://ci.chromium.org/p/gerrit/g/luci-test%20CI%20builders/console
[2] https://chromium.googlesource.com/infra/luci/luci-go/+/HEAD/lucicfg/doc/README.md#luci.console-view-args

Change-Id: I285810245e355215453de18a86e45c9b316d282c
diff --git a/main.star b/main.star
index f48d9b6..bc93274 100755
--- a/main.star
+++ b/main.star
@@ -184,6 +184,7 @@
 # current luci-test build status at HEAD
 luci.console_view(
     name = 'luci-test CI builders',
+    refs = ["refs/heads/main"],
     repo = "https://gerrit.googlesource.com/luci-test",
     entries = [
         luci.console_view_entry(builder='ci/Verify luci-test CL'),