spec: fix webpack aux build
spec: fix webpack aux build

refs CNVS-25916

this file moved, and so was no longer buildable

TEST PLAN:
 1) webpack aux build should pass

Change-Id: Ib89abbcd4e21d0dd2abf957e695d20b914cffd2d
Reviewed-on: https://gerrit.instructure.com/70324
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Jenkins
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
QA-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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