Better indicate in the UI the configured schedule for check-ins.

Right now when a monitors schedule is changed, there's no indication as to what schedule previous check-ins were using. This can be confusing when things like missed check-ins were being produced when the schedule was incorrect. What would be nice would be to indicate that check-ins were using a different schedule. This get's a bit tricky when you change a schedule, but the next expected time doesn't update. But we should be able to mark that some how as well.