Update shortText for patient.deceased

[medcomire]

Please add a description that if only patient is deceased the flag deceased shall be sent even the fact that the deceaced flag is must support

[MedComAnders]

If posiable create constrains only true. never false.

[tmh-mjolner]

If posiable create constrains only true. never false.

It is normally allowed to set it to false even though it means the same as if the value is not set

[MedComAnders]

Has been fixed in #191