[Enhancement] Disable upcoming reminder if task is alredy done

[pwall2222]

When you create a task and create this reminders:

• In 30 min
• In 1 hour
• In 2 hour And you after 1 hour check off the task, the 2 hours reminder will still pop up even though the task is finished. (From what I have searched through the code, it's a matter of when completing a task in completeTaskForUser, to delete or disable the reminders)