Fixing non-square profile images for hovercards
Summary: Refs T1048 - disables bg repeat, centers profile image
Test Plan: looked at my own hovercard in my local install, which has a non-square prof pic
Reviewers: epriestley, chad
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T1048
Differential Revision: https://secure.phabricator.com/D5604