don't disable preventDefault() for kylmenu links

refs: CNVS-14966

Test Plan:
  - Using screenreader/keyboard-only navigation
  - Go to the modules page (/courses/##/modules)
  - open the cog menu on module
  - hit space on the "delete" option
  - the page should not reload

this test plan is just one of many things that were
broken by not being able to .preventDefault()
on kyleMenu options.

@acannon, was there some reason that we needed to
force not being able to .preventDefault()?
see: https://developer.mozilla.org/en-US/docs/Web/API/Event.initEvent

Change-Id: Ibca3ed9fe8fc199e25c75313159d10d0563165a1
Reviewed-on: https://gerrit.instructure.com/40952
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>