display right breadcrumb and active tab for announcements/discussions
display right breadcrumb and active tab for announcements/discussions

fixes: #10083

test plan:
go to discussions index, edit, show, and new pages,
make sure highlighted tab is discussions and breadcrumb
says "Discussions"

do the same for announcements but make sure crumb is
"Announcements" and active tab is announcements

Change-Id: I9cf981ad8e7ffe8c7d17ec66bdbad81c93cf1947
Reviewed-on: https://gerrit.instructure.com/13072
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jake Sorce <c8d99c2f7cd5f432c163abcd422672b9f77550bb@instructure.com>
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>

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