Restore name input placeholder in assignment view
Restore name input placeholder in assignment view

test plan:
 - All tests pass

Refs EVAL-2295
flag=none

Change-Id: Ie7c9c07e62c16109f6bf35d399c366b4295d953b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/289419
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Aaron Shafovaloff <d0ee6b99167c663aba7bc3efd806fe8d6cad437b@instructure.com>
Product-Review: Jody Sailor
Reviewed-by: Eduardo Escobar <7e82d09bba767b0dd1222915e3d92141089e94a8@instructure.com>
Reviewed-by: Kai Bjorkman <4693b3d9e71784d629732770ab5e83ed8fbdb83e@instructure.com>

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