Use pkg.removed everywhere

Summary:
Previously, pkg.installed was used instead of pkg, with the installed
method on a separate line.

This change applies the same standardization for pkg.removed.

This is a follow-up for 3861c7a31087.

Test Plan: no op

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1845