alert-manager: Fix display of matching silences.
alert-manager: Fix display of matching silences.

Bug: skia:
Change-Id: I29546bde897781a912153789466e4fedc812f937
Reviewed-on: https://skia-review.googlesource.com/c/174603
Auto-Submit: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot