Issue Summary

You can make modifications to the URL parameters and essentially override the calendar owner's settings. For example, if I only want others to be able to schedule 10 minutes meetings every 10 minutes, I don't want them to be able to just change a URL parameter and request a 1 hour meeting and block out my schedule like that.

Steps to Reproduce

1. The duration in settings is set to 10 minutes:
   

2. Go to my link and add a URL param of duration, for example:
   https://cal.com/amanuel/30min?duration=15

3. The UI actually lists a slot every 15 minutes and 15 minutes in length
   

4. Booking is actually confirmed for 15 minutes:
   

5. It also shows up in my dashboard under upcoming bookings:
   

6. This can be reproduced using any number for the duration.

_CAL-914