Repair Database does not prune old Poller Item Records

[TheWitness]

Describe the bug

When you run the repair_database.php script, it does not remove orphaned poller item records.

To Reproduce

Steps to reproduce the behavior:

1. Have many orphaned poller_items

2. Run the repair database script

3. Note that those poller items still exist

Expected behavior

They should be removed, and on subsequent 'full-sync' should be removed from remote data collectors.

[TheWitness]

Porting complete.