fix speedgrader buttons for discussion in a group
fix speedgrader buttons for discussion in a group

Change-Id: Ic49ae1e19b5f70b4897f48bc827d8e665dd1008d
Reviewed-on: https://gerrit.instructure.com/9706
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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