fix initial gravatar view in avatar dialog in user settings

needed PROFILE key in ENV like on profile page.

fixes CNVS-12104

test plan:
 - go to user settings (settings in upper right).
 - click on the avatar image.
 - go to the gravatar tab; the default email should load.

Change-Id: Ic50263df44143501033e9ea4d77f68e1fede9693
Reviewed-on: https://gerrit.instructure.com/32618
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Braden Anderson <banderson@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Product-Review: Jon Willesen <jonw@instructure.com>