fix small textarea in speedgrader
fix small textarea in speedgrader

fixes: GRADE-1225

test plan:
- speed grader comment box is no longer "small" (aka one line in height)

Change-Id: If8c544c3f8aa6a29c93f2702a868cf3b7d846b7e
Reviewed-on: https://gerrit.instructure.com/158132
Tested-by: Jenkins
Reviewed-by: Gary Mei <4dff5ebcff9ed76793b70b9470ac64791a16ed11@instructure.com>
Reviewed-by: Adrian Packel <9c6a39807293376f29cba17542b4cb1b663ecc4a@instructure.com>
QA-Review: James Butters <4c5a489c9bb72d41f20b3b22aaf4c9b864e32f20@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms