Fix migrations and the new screening flow after rebase

hypha/apply/api/v1/screening/serializers.py

...ply/funds/migrations/0081_add_screening_statuses_field.py

...ns/0082_migrate_screening_status_to_screening_statuses.py

hypha/apply/funds/migrations/0083_auto_20201021_1129.py

...ly/funds/migrations/0083_remove_screening_status_field.py

...s/templates/funds/applicationsubmission_admin_detail.html

hypha/apply/funds/utils.py

hypha/apply/funds/views.py