change module api completion field presence
change module api completion field presence

return false when no other requirements have been completed

test plan:
* create a module with a required item
* as a student, without completing any other
 requirements, the context module items
 api should list the "completion_requirement"
 item as "completed": false

closes #CNVS-24152

Change-Id: I0d5235d2e00a5097ec9e00f0f11d593a5a733eb7
Reviewed-on: https://gerrit.instructure.com/65510
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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