Remove the Jobs table

This table has been superfluous for a long time.

src/lib/Hydra/Controller/Build.pm

@@ -86,7 +86,7 @@ sub build_GET {
         $c->stash->{prevBuilds} = [$c->model('DB::Builds')->search(
             { project => $c->stash->{project}->name
             , jobset => $c->stash->{jobset}->name
-            , job => $c->stash->{job}->name
+            , job => $c->stash->{job}
             , 'me.system' => $build->system
             , finished => 1
             , buildstatus => 0