[lib] Simplify rolePermissions merge condition in makePermissionsBlob
[lib] Simplify rolePermissions merge condition in makePermissionsBlob

Summary: These conditions are logically equivalent.

Test Plan: Careful visual inspection

Reviewers: atul

Reviewed By: atul

Subscribers: KatPo, palys-swm, Adrian

Differential Revision: https://phabricator.ashoat.com/D1215

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