kill horizontal scroll bar on flickr upload modal
kill horizontal scroll bar on flickr upload modal

fixes CNVS-28098

TEST PLAN:
 1) go edit a wiki page
 2) try to embed an image
 3) go to the flickr search tab
 4) you should see no horizontal scroll bar

Change-Id: I5c8cacefa5b494e47d876dbd407645f89676322c
Reviewed-on: https://gerrit.instructure.com/74750
Tested-by: Jenkins
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Jeremy Putnam <b030d6d6f199f844ec424882be473c2ab9adc93b@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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