[server] Use dashes instead of underscores in script filename

Test Plan: This script should be run by hand, so there's no need to test it again after this change

Reviewers: ashoat

Reviewed By: ashoat

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

Differential Revision: https://phabricator.ashoat.com/D699