tests: Adapt tracker-backup-test to non-GPrivate interfaces
This code relies on being able to query again the contents immediately after restore, this may or may not be true depending on the TrackerDBInterface used on the posterior query (eg. not being the one that performed the update). Since testing access from multiple DBInterfaces is not in the scope of this test, just add an extra TrackerDataManager initialization in between to ensure the interface used on the query is up to date.
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