Ensure right-hand-card adheres to sort ordering

This ensures that the right hand card trail adheres to the same ordering the main story package has applied to it. This prevents duplication errors.

After discussing with @rich-nguyen story-packages should really be filtered/sorted much higher up the chain, for example inside the Content model. Though that re-factoring is out of the scope of this simple fix.

#### Before
![screenshot from 2013-11-12 13 50 07](https://f.cloud.github.com/assets/80089/1522142/f3d55af4-4ba2-11e3-9071-2b4638a7f1cf.png)

#### After
![screenshot from 2013-11-12 13 47 27](https://f.cloud.github.com/assets/80089/1522144/f920abee-4ba2-11e3-8a62-6f8664b70f8b.png)