remove horizontal scroll in token creation dialog
remove horizontal scroll in token creation dialog

fixes CNVS-17772

test plan:
- go to your user profile page
- generate an access token
- it should be displayed in the dialog, and you shouldn't have to scroll
  horizontally to see the whole thing.

Change-Id: I1b7b1165f2e79e0575b326c974868937758a4b11
Reviewed-on: https://gerrit.instructure.com/46594
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>
QA-Review: Adam Stone <a0b2b61e2edcf99aa16080c2254a6ae6923d1fac@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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