Cal obs request form should include lunar separation angle

[nvolgenau]

The error message

non_field_errors: According to the constraints of the request, the target is never visible within the time window. Check that the target is in the nighttime sky. Consider modifying the time window or loosening the airmass or lunar separation constraints. If the target is non sidereal, double check that the provided elements are correct.

indicates that the minimum lunar separation angle can be modified in the request form. However, the angle is not among the request parameters. It should be added.