converts context/media_object_inline js_block into js_bundle

test plan:
* regression test context media object inline

Change-Id: If5a7685f53cba1b5a83b97b7d55f6554b1daff40
Reviewed-on: https://gerrit.instructure.com/29164
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Marc LeGendre <marc@instructure.com>
QA-Review: Marc LeGendre <marc@instructure.com>