[server] Added -1 type support to changeRole and changeRoleThreadQuery
[server] Added -1 type support to changeRole and changeRoleThreadQuery

Summary: Added -1 type support to changeRole and changeRoleThreadQuery.

Test Plan: Ran flow and made sure accounts could still be created and threads still work.

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D656

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