R1:9757edb268aa

Fix "Resign as Reviewer" to appear only when actually a Reviewer

Summary: Is this an appropriate place to say "herp derp?"

Test Plan: Check for Resign as Reviewer for the following table
waiting for review | accepted | committed
Am actually reviewer
Am not reviewer but CC'ed
Unrelated

Reviewers: epriestley

CC:

Differential Revision: 140