Removing Category Failure for the tests which are now passing from Core UI Tests project.

- As a part of defect MAGN-4178, Sharad asked me to turn on UI tests which are marked as Failure, if they are passing on current build.

So turning them ON by removing their category "Failure"

<h4>Reviewer</h4>
@Benglin @ikeough @lukechurch 
![image](https://cloud.githubusercontent.com/assets/5109531/4041392/35a9ba04-2cf5-11e4-9f7b-59af1e5201c5.png)