Revert PR 1711; disabling JS tests again

Saw a failure in master on one of the JS video tests that was recently enabled:
https://jenkins.testeng.edx.org/job/edx-all-tests-auto-master/447/

The rationale for re-enabling them was that the tests had been fixed by another PR.  I'm not sure if all of these are flakey, but I'm disabling them just in case.

@jzoldak