clean up permission blocks a little

don't take a session param if it's unused

Change-Id: Ic24a17311bd6353892310e309b70397567e36ef8
Reviewed-on: https://gerrit.instructure.com/36251
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>