Fixes the first half of bug #53

Fixed the passing of the row the user selected when choosing a
congregation to edit. Before the index of the selection was passed but
with this edit, the actual congregation id is passed.
Fixed the second half of bug #53.

Since main.py was sending the index number of the congregation selected
instead of the actual row id number, the code had to compensate. That
has been fixed. The actual row id is passed now.