[BUGFIX] Remove defined height for outerframe

If you have a gallery description the gallery list output is messed up. Tested in Firefox (26), Chrome (32), IE (10 bis 7), Opera (12) und Safari (5.1.7) - alles unter Windows ![2014-02-14_003927](https://f.cloud.github.com/assets/1453345/2166653/0ac628fa-950a-11e3-9cc3-5d9b4181e8ec.jpg)