fix(DailySchedule): improve identification of today's service

[thecristen]

Summary of changes

Asana Ticket: Schedule finder "Daily Schedule" selection doesn't match current date

• The logic for "is this service current?" founders in the face of this rating's weekday schedule, which features added dates which are outside of the start/end date range. We improve this by disentangling the added date check from the start/end date check
• The current logic picked the first of today's valid services as the 'default' selection. We improve this by first checking for the "default_service?" flag on the service.