Revert "[js] Add mod_runme.js"

This reverts commit ea514c3.

The new runme.js isn't used for node because it fails to run
multicpptest testcases, but was failing for jsc in CI.

The first problem is the new file is missing `new` where the two
objects are created, but fixing that reveals that this testcase
is currently broken for Javascript so just revert for now.

Author: ojwb