[METRICS SDK] Remove extra OfferMeasurement call in SyncMetricsStorage::OfferMeasurement

[ThomsonTan]

Fixes # (issue)

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• [ ] CHANGELOG.md updated for non-trivial changes
• [ ] Unit tests have been added
• [ ] Changes in public API reviewed