[FIX] head duplication

Author: emjay0921

spp_demo_common/models/demo_data_generator.py

@@ -147,7 +147,6 @@ def _generate_demo_data(self, fake):
         new_group_name = False
         for _ in range(num_members):
             head_membership = self.head_member_getter(group)
-            have_head_member = bool(head_membership)
             is_head_member = random.choice([True, False]) if not have_head_member else False
 
             # Check if last member and no head member assigned yet