Include submitted review requests in the "Starred Reviews" page in the dashboard.

While users can star submitted reviews, they do not appear in the "Starred
Reviews" page of the dashboard. To fix this, I modified DashboardDataGrid to
include submitted reviews when it displays the starred reviews, by filtering
all public starred reviews. Also, we need to keep the counts for starred
reviews consistent, so in accounts.Profile, I included ReviewRequest.SUBMITTED
when we star or unstar a review request.

Testing done:
Manual testing: starred and unstarred a combination of submitted and
non-submitted reviews to see if they would be displayed properly on the
dashboard.

Reviewed at https://reviews.reviewboard.org/r/4578/
Fixes bug 1075.