Don't set the default size and background color for the Aphlict client SWF.

Summary: These settings don't seem to make any difference and are somewhat confusing.

Test Plan: Sent myself test notifications via /notification/status. Things seemed to work.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9337