Remove empty access panels column for image collections.

Per @jvine (non-merged) File and Image collections should not have anything that would invoke an access panel so we should not have an empty column reserved for it on the page.

### Before
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![before](https://cloud.githubusercontent.com/assets/96776/3127343/9ccc55c2-e7bb-11e3-8fff-aac893ac780f.png)

### After
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![after](https://cloud.githubusercontent.com/assets/96776/3127345/a2aec2e0-e7bb-11e3-9e75-7c223c9c8eec.png)