R1:212d4d0dc753

Migrate Differential Revision SavedQueries to the new "statuses" tokenizer

Summary: Ref T2543. This migrates existing saved queries so they use the right modern values for the new tokenizer control, introduced in D18393.

Test Plan:
- Saved a query with "Abandoned" selected as the status in the old "<select />", prior to D18393.
- Upgraded to D18393, which broke the query (it no longer selected any status filter).
- Ran the migration to fix things.
- Saw the query now execute with "Abandoned"…