Fix overly restrictive auth check for user lookup on Sourcegraph.com
Created by: sqs
fix #2480
The commit e2256f1474eb8c432f82750e57012c0cbc295ddd added a too-restrictive check that prevented users from looking up their own info, which prevented them from accessing their settings page or profile/account pages. See #2375 and #2379 for discussion of the original commit.