metrics: make metrics library also use /var/lib/metrics/uma-events

I missed this when I changed the location used by the metrics
daemon.

BUG=chromium:447256
TEST=none
BRANCH=none

Change-Id: Ie964abb70911bcdc79993b62a066ea77f65acfa5
Reviewed-on: https://chromium-review.googlesource.com/261463
Tested-by: Luigi Semenzato <semenzato@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Luigi Semenzato <semenzato@chromium.org>
2 files changed
tree: 82a37445bd01ffdfcde18734b5923a4ee2a0d71a
  1. metrics/