Fix "does nothing if item not moved far enough" js test to work with firefox 59

Description

We upgraded jenkins-workers to use firefox 59 on https://build.testeng.edx.org which caused a js test to fail, so we removed it. This should be fixed and re-added if it is important enough to the test suite.

Here's the PR removing the test. https://github.com/edx/edx-platform/pull/17980/files

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Reporter

Mike Youngstrom

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