make sections not cut off in gradebook2
make sections not cut off in gradebook2

test plan:
  - As a teacher, open Gradebook2 for a course that has multiple
    students in multiple sections.
  - In the leftmost column, where the student names are, verify the
    section names are there. The section names should not be cut off.

fixes CNVS-4581

Change-Id: I6d546ba51ebd1d0a7829c936eff64f10892aa3ae
Reviewed-on: https://gerrit.instructure.com/18626
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Product-Review: Stanley Stuart <2b43fb8b7a234825d50dd49ce7892d78a59da8f3@instructure.com>

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