remove "Select time" toggle in email embed generator

![CleanShot 2023-08-28 at 22 34 50@2x](https://github.com/calcom/cal.com/assets/8019099/96930c20-0371-4b74-a924-224e16885e41)


![CleanShot 2023-08-28 at 22 34 57@2x](https://github.com/calcom/cal.com/assets/8019099/2e236976-3aa4-43ee-8beb-d9e23af4b293)
