fix timezone async specs for requirejs 2

Change-Id: I0d0894535e4ac7cc470d235d3024b7cce5322f3e
Reviewed-on: https://gerrit.instructure.com/31663
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Aaron Shafovaloff <ashafovaloff@instructure.com>
Product-Review: Jacob Fugal <jacob@instructure.com>
QA-Review: Jacob Fugal <jacob@instructure.com>