changed the filter_by query

Author: shreyanshdwivedi

app/api/role_invites.py

@@ -167,7 +167,7 @@ def accept_invite():
                 user.is_verified = True
                 save_to_db(user, 'User verified')
             if role_invite.role_name == 'owner':
-                previous_uer = UsersEventsRoles.query.filter_by(event=event).filter_by(role=role).first()
+                previous_uer = UsersEventsRoles.query.filter_by(event=event, role=role).first()
                 if previous_uer:
                     delete_previous_uer(previous_uer)