max width on quiz input boxes
max width on quiz input boxes

fixes CNVS-20699

test plan:
  - go to quiz edit page
  - the input borders no longer stretch
    the whole width of the screen

Change-Id: I7826503c56394d70d9bdd060dc848f906d03a017
Reviewed-on: https://gerrit.instructure.com/54968
Tested-by: Jenkins
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
QA-Review: Michael Hargiss <59e3fde81b8d9a4f5e0cc016a3c2695591912604@instructure.com>
Product-Review: Hilary Scharton <b55b20a171673afabe1f3f421d6770a86afaa815@instructure.com>

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