Properly enable the xomManatee flag in the edit tab of content previews
Properly enable the xomManatee flag in the edit tab of content previews

Summary: Previously, the xomManatee flag was dependent on localStorage.xomManatee, which isn't set in webapp. Now, whenever the preview is for a touch device the xomManatee flag is set to true.

Test Plan:
- Verified in webapp after building Perseus that content is rendered with the xomManatee flag (http://localhost:8081/math/early-math/cc-early-math-counting-topic/cc-early-math-counting/e/counting-objects/edit/xbbb09a2e67bc1e04 as an example)
- Verified that the previously incorrectly rendered SAT problem now has the graphs rendered correctly

Reviewers: kevinb

Reviewed By: kevinb

Subscribers: jared

Differential Revision: https://phabricator.khanacademy.org/D29856

ariabuckles/perseus,learningequality/perseus,ariabuckles/perseus,learningequality/perseus,ariabuckles/perseus,ariabuckles/perseus