hide sequential order checkbox when first edited
hide sequential order checkbox when first edited

test plan:
* edit a context module with no requirements
* the checkbox for sequential order should not be shown
 until there are requirements

closes #CNVS-24094

Change-Id: Iae993d2f9f23713a33886872bd46ab29b3d0ee61
Reviewed-on: https://gerrit.instructure.com/65293
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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