Remove Google Optimize anti-flicker snippet
Remove Google Optimize anti-flicker snippet

We are rarely/never running Optimize experiments, so I think this was
paying in page-load performance for nothing.

codecombat/codecombat,javatlacati/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,javatlacati/codecombat,javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,codecombat/codecombat