Missed annotating the SettingsChangeLogger as singleton in ag/29424931.
Tested with commands
> m statsd_testdrive
> $ANDROID_HOST_OUT/bin/statsd_testdrive -terse 10108
Verified logSnapshot is called on same instance of SettingsChangeLogger.
Bug: 361850561
Test: Manual
Flag: NONE Dagger Integration
Change-Id: Icdbe57623bb0ce1a2ef55cdab238e1f9bfbedf40