adjust font size in gradebook2 settings menu
adjust font size in gradebook2 settings menu

fixes CNVS-5525

test plan
- check items in settings wheel for gradebook2
- confirm the font sizes are the same
- confirm that text still fits
- double check that the 'Showing all Sections' menu looks correct

Change-Id: Id6a7ebd400bdf2aabfed7aa58b0989c4040d1b5e
Reviewed-on: https://gerrit.instructure.com/28971
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Reviewed-by: Mike Nomitch <74443f6f110b6b7b934c89126258ed3d843d673f@instructure.com>
Product-Review: Liz Abinante <ce3305c9be70e1a5a9ff49df19e1a5b24d5a47f8@instructure.com>

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