avatar image fills circle
avatar image fills circle

fixes CNVS-12018

test plan
- view a non-square avatar
- ensure that the bordering circle is filled

Change-Id: I70d635b4ac908294c75173d8474a852781f0966e
Reviewed-on: https://gerrit.instructure.com/32976
Reviewed-by: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Trevor deHaan <85df72112e8a9484fec7b3db2e31789c2c2d4e07@instructure.com>
Product-Review: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>

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