Bug 1023663 - [User story] Calendar day view should start at 8 AM r=millermedeiros

Currently, the patch is for ui review. It is not ready for code review.
this check seems unnecessary. this method is only called internally, and hours should always be between 0 and 23.. also `0 * 50 === 0`..

so I would remove the `if/else` and keep just the `return hour * 50;`