mark "use_new_styles" as in "development"
mark "use_new_styles" as in "development"

...so it is impossible to turn on in production.
With this set, you can only turn it on in
development / test / beta instances. Even though
it is already marked "beta", without this, a csm
could technically still turn it on for a customer
even though we clearly told them not to.

closes: CNVS-21233

Change-Id: Icb86594d052effde1abdc8d5e3732375b801cb27
Reviewed-on: https://gerrit.instructure.com/56433
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
QA-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins

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