Trim strings added to persistent snoozed notification storage.

Fix: 258422365
Test: atest NotificationManagerServiceTest SnoozeHelperTest; Also tested the reproduction steps in b/258422365#comment6 manually to check that the issue doesn't happen anymore.
Change-Id: I5a2823f10053ea8c83c612a567d6d4f1b6af23e7
2 files changed