Days are shifted in WeekView

Sunday is shown, Friday is not when sat/sun are unchecked.
When sat is checked, it's not shown.

![screen shot 2017-06-19 at 5 32 12 pm](https://user-images.githubusercontent.com/20050977/27311417-97ad07ce-5515-11e7-9530-37928660d28e.png)
![screen shot 2017-06-19 at 5 32 33 pm](https://user-images.githubusercontent.com/20050977/27311416-9799cb00-5515-11e7-915a-6eca286002cb.png)
