/updateAttendance has hard coded leader ID

Notice that the leader ID is always inserted as 2:
```SQL
var action = await conn.execute(
"insert into tblAttendance (today, kidID, verse, visitors, leaderID, organizationID)"
"values (:today, :kidID, :verse, :visitors, 2, :orgID);",
{
'kidID': attendance.kidID,
'today': attendance.today,
'verse': verse,
'visitors': visitors,
'orgID': organizationID,
});
```

Start at the /updateAttendance implementation and inspect the attendance INSERT query shown in the issue. Trace where the leader ID should come from, replace the hard-coded value with that source, and verify that the inserted attendance record uses the selected leader ID.

Written by the indexing model from the issue text.