Prevent patient registration form from being edited before form initialization

[samau3]

Since the form needs to initialize values based on the response from the server, a user may start typing in the form before initialization is finished. This would cause unexpected data loss, so the use of enhanceGetInputProps should be used per the Mantine documentation.

The relevant piece from the linked documentation:

Note that form.initialize will erase all values that were set before it was called. It is usually a good idea to set readOnly or disabled on all form fields before form.initialize is called to prevent data loss. You can implement this with enhanceGetInputProps