[server] Have script viewers automatically pass checkThreads

Summary: This is so we can use updateThread in scripts without having to pass permission checks

Test Plan: Tested in concert with upcoming script

Reviewers: subnub, palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, zrebcu411, Adrian, atul, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D788