Bugfix: Unable to save a task

The problem is that `relative_start_day` and similar fields are undefined until an on change event sets them. We'd need to handle setting initial values for this to work correctly.

My change removes validation on select boxes, I think this is fine because: 

1. It fixes the issue
2. A user can not select an invalid option from the select fields anyway
3. It simplifies the code
4. I don't see how we can solve this p1 and keep the validations in place, without changing how validations are implemented. I'm not saying we shouldn't fix the real problem here, but it's probably out of scope for a point release before we deploy to production.