[Fix] Stage build success message style.

BUG=b:286453866
TEST=manual;

Change-Id: I3a19ada2aa12fa204e1a2b173b7545f95e1d53e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/moblab/+/4885660
Commit-Queue: Boris Lok <boris.lok@cienet.corp-partner.google.com>
GCB-Verify: 596262695487@cloudbuild.gserviceaccount.com <596262695487@cloudbuild.gserviceaccount.com>
Reviewed-by: Varun Thammineni <varunth@google.com>
Tested-by: Varun Thammineni <varunth@google.com>
1 file changed