toolchain-utils: Fix hyphen/underscore issue for nightly tests.

The recipe builders use hyphens, while gsutil uses underscores.  We
had a fix in place for this for veyron_minnie; this updates the fix for
veyron_tiger.

BUG=None
TEST=None

Change-Id: Ide32264e1cbbe29afc8ca2cd44e449b56f91a2c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2585646
Auto-Submit: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
1 file changed