Unit Tests

- Removed mention of synch.key from all unit tests.  This is an obsolete file.

test/custom.columns.t

@@ -47,12 +47,11 @@ my $output = qx{../src/task rc:custom.rc foo 2>&1 >/dev/null};
 like ($output, qr/Unrecognized column name 'foo'\.\n/, 'custom report spotted invalid column');
 
 # Cleanup.
-unlink qw(pending.data completed.data undo.data backlog.data synch.key custom.rc);
+unlink qw(pending.data completed.data undo.data backlog.data custom.rc);
 ok (! -r 'pending.data'   &&
     ! -r 'completed.data' &&
     ! -r 'undo.data'      &&
     ! -r 'backlog.data'   &&
-    ! -r 'synch.key'      &&
     ! -r 'custom.rc', 'Cleanup');
 
 exit 0;