The consanguinity status of a patient isn't set when identifiable from the pedigree

Steps to reproduce:

• create a patient record

• open a pedigree and make patient's parents be siblings

• save pedigree

• in the patient form Consanguinity isn't set to true

Please note that this used to work in the past. Here is the original task https://phenotips.atlassian.net/browse/PT-2434.