fix 'hide students names' in GB when outcome gradebook is enabled
fix 'hide students names' in GB when outcome gradebook is enabled

also - only init the gradebook slickgrid the first time the view is shown

fixes CNVS-12079

test plan:
- with and without outcome gradebook feature flag enabled
- 'hide/show student names' in the gradebook should work
- switch back and forth between outcome gradebook and gb2, it should remember
  your gb2 settings, like 'hide student names'

Change-Id: I0b8b0087bc1265a4af4a015cc10a3559b3af7685
Reviewed-on: https://gerrit.instructure.com/32737
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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