fix(gerrit-tvl): Fix construction of ref used in Buildkite r/3593

... and remove a spammy log statement.

This changed in besadii a while ago and lead to the behaviour of
failing silently, instead of failing with an error saying "undefined
undefined".

Note that with this change merged the plugin probably still won't work
again, but it gets us a step closer to the real error.

Change-Id: I3db25d246f4b1c634d316cd92574e27fb220d769
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4887
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

0 files changed, 0 insertions, 0 deletions