In the 'Set Due Date' dialog, if FSRS is enabled, we should NOT show 'set interval to the same value'

The default should be true: interval should always match due date

https://discord.com/channels/368267295601983490/1282005522513530952/1324758732122624020

• Implement Set Due Date dialog #14729
• feat: "set due date" #15699

⚠️ This deviates from upstream functionality, but I consider it to be a bugfix