R1:713f8fb373e4

Fix a bug which could cause imported events to set themselves as their own parents

Summary: Ref T11808. This variable is wrong, and would sometimes cause events to set themsevles as their own parents. They would then fail to load, and disrupt cursor paging.

Test Plan:
- Reproduced T11808 locally by reloading test data 2+ times, creating events with themselves as their own parents.
- Appplied fix.
- Nuked data, reloaded, no more self-parents.
- Test datafile: {F1894017}

Reviewers: chad

Reviewed…