make the question input box bigger
make the question input box bigger

fixes CNVS-23375

test plan:
- see if the box for inputting a grade in speedgrader is bigger

Change-Id: Ia43d59dfccba22e0a6ef01acb25dd0d6e8934dc4
Reviewed-on: https://gerrit.instructure.com/66554
Tested-by: Jenkins
Reviewed-by: Ryan Taylor <2eafa1f6bf34395b543d6ca7f438461b0774d24f@instructure.com>
QA-Review: Landon Holmstead <b4d1c6463a1591700c2e13e0c1e3c65dd54f4c60@instructure.com>
Product-Review: Jason Sparks <542e620f0c6c3447ce6e2e8c83a97102b99f89c6@instructure.com>

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