Revert "add :read and :read_sis permissions on pseudonym"

This reverts commit 9d49603aa1463ef228a44251b61eebdaf4f6e426.

fixes CNVS-17290

Change-Id: I50502bd8569294232c3c2f24e7fee8af1b9ec543
Reviewed-on: https://gerrit.instructure.com/45388
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Matt Fairbourn <mfairbourn@instructure.com>