Remove the old avatar from the infopane.

* Removed the preference for hiding the info pane as that will not be an option
going forward.
* Removed the preference for animating avatars as they shouldn't be animating
unless the user is doing something like type, talking, or hovering over the
icon.

Testing Done:
Ran locally.

Reviewed at https://reviews.imfreedom.org/r/560/