[lib] Fix containingThreadID typo in usePotentialMemberItems

Summary:
Super minor, but noticed while working with usePotentialMemberItems so figured I'd fix.

Depends on D12158

Test Plan: NA, just made sure new name doesn't collide with any existing names.

Reviewers: ashoat, ginsu, tomek, varun

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D12254