discussions speedgrader link should open in new tab
discussions speedgrader link should open in new tab

fixes CNVS-13285

test plan:
- go to a graded discussion
- open the cog menu
- click the "SpeedGrader™" link
- it should open in a new tab/window

Change-Id: Ia16d723bed7b5548ff8a3ad0d0a09c4da5111e5a
Reviewed-on: https://gerrit.instructure.com/51018
Tested-by: Jenkins
Reviewed-by: Mike Nomitch <74443f6f110b6b7b934c89126258ed3d843d673f@instructure.com>
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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