Jobset.pm: Detect channels by isChannel attribute.

We now no longer need that additional join of the build outputs and can
solely use the isChannel column of the Builds table to determine whether
it's a channel build.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

src/lib/Hydra/Controller/Jobset.pm

@@ -160,9 +160,8 @@ sub channels_tab : Chained('jobsetChain') PathPart('channels-tab') Args(0) {
 
     foreach my $eval (@evals) {
         my @builds = $eval->builds->search(
-            { 'buildproducts.type' => 'channel' },
-            { join => ["buildproducts"]
-            , columns => ['id', 'job', 'finished', 'buildstatus'] }
+            { ischannel => 1 },
+            { columns => ['id', 'job', 'finished', 'buildstatus'] }
         );
         foreach my $b (@builds) {
             my $jobName = $b->get_column('job');