Fix datepicker in add deployment form

[nathanielrindlaub]

The date picker falls below the input field, which pushes it off of the screen, and the Yup validation needs re-working (it's nearly impossible to type in a date in the input field without it getting auto-corrected to "invalid date")

[nathanielrindlaub]

The save/cancel buttons were also pushed way down off the modal box on Kelly's computer... look into this

[nathanielrindlaub]

Fixed the date picker, but the save/cancel button issue is a larger problem w/ using the modals. I think the longer term fix is to abandon the modals for content-heavy tasks like managing the cameras and give the cameras their own panel instead.