Fix submit contract document category permission with required remaining...

Fix submit contract document category permission with required remaining categories instead of remaining categories (#4078)

Fix bug for submit contract document by applicant.

Right now, there is an option in wagtail to set a contract document
category optional/required but in Ui for applicants we are just checking
for remaining contract document categories for submit contract document
permissions while it should be checking for required only because others
are optional.