The dispatch.js tests now no longer go through server_events.js,
so the tests are isolated from some of the setup you have to
do for the main event loop. They now directly call into
server_events_dispatch.js.
* In most cases, eslint --fix with the right comma-dangle settings was
able to update the code correctly.
* The exceptions were cases where the parser incorrectly treated the
arguments to functions like `assert_equal` as arguments; we fixed
these manually. Since this is test code, we can be reasonably
confident that just fixing the failures suffices to correct any bugs
introduced by making changes automatically.