Fix "My Jobs" tab in user dashboard

Nowadays `Builds` doesn't reference `Project` directly anymore. This
means that simply resolving both `jobset` and `project` with a single
JOIN from `Builds` doesn't work anymore. Instead we need to resolve the
relation to `jobset` first and then the relation to `project`.

For similar fixes see e.g. c7c4759600.

src/lib/Hydra/Controller/User.pm

@@ -463,7 +463,7 @@ sub my_jobs_tab :Chained('dashboard_base') :PathPart('my-jobs-tab') :Args(0) {
         , "jobset.enabled" => 1
         },
         { order_by => ["project", "jobset", "job"]
-        , join => ["project", "jobset"]
+        , join => {"jobset" => "project"}
         })];
 }