fix quizzes/quizzes_stats_spec.rb in selenium
fix quizzes/quizzes_stats_spec.rb in selenium

refs CNVS-25916

the "app" directory as root is only present for docker users.
we can just remove it from the matchers for jsx loaders
and then these work on jenkins too.

TEST PLAN:
 1) spec/selenium/quizzes/quizzes_stats_spec should pass in selenium
    webpack build

Change-Id: I51f915452de5f4a3f98407d6e3b90a4b18a8671e
Reviewed-on: https://gerrit.instructure.com/70292
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
QA-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
Tested-by: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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