Use "password" for additional Postgres databases, not "pass"

Being more explicit sounds better.

roles/matrix-postgres/templates/init-additional-db-user-and-role.sql.j2

@@ -10,7 +10,7 @@ $$;
 
 -- This is useful for initial user creation (since we don't assign a password above) and for handling subsequent password changes
 -- TODO - we should escape quotes in the password.
-ALTER ROLE {{ additional_db.username }} PASSWORD '{{ additional_db.pass }}';
+ALTER ROLE {{ additional_db.username }} PASSWORD '{{ additional_db.password }}';
 
 -- This will generate an error on subsequent execution
 CREATE DATABASE {{ additional_db.name }} WITH LC_CTYPE 'C' LC_COLLATE 'C' OWNER {{ additional_db.username }};