fix menu fail for admin links
fix menu fail for admin links

refs CNVS-25916

mouseup is always accompanied by mousedown, but when it fires first
it messes up the kylemenu.  this fixes it.

TEST PLAN:
 1) groups_teacher_spec should pass webpack selenium build
Change-Id: I2978787feadd5b31ae5a7d258c5f27cc4f9536eb
Reviewed-on: https://gerrit.instructure.com/69417
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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