Project: fix DELETE route

This appears to have been broken in ac3e8a4a59,
which removed the `jobsetevals` column from the Projects schema, but didn't
update the Controller accordingly.

Fixes the test added in the previous commit.

src/lib/Hydra/Controller/Project.pm

@@ -78,7 +78,7 @@ sub project_DELETE {
     requireProjectOwner($c, $c->stash->{project});
 
     $c->model('DB')->schema->txn_do(sub {
-        $c->stash->{project}->jobsetevals->delete;
+        $c->stash->{project}->jobsets->delete;
         $c->stash->{project}->builds->delete;
         $c->stash->{project}->delete;
     });