Fix username field in check_txn_idle; broken when adding support for objects owned by group roles in commit d55287f

Author: glynastill

check_postgres.pl

@@ -8102,7 +8102,7 @@ sub check_txn_idle {
         $whodunit = sprintf q{%s:%s %s:%s %s:%s%s%s %s:%s},
             msg('PID'), $maxr->{pid},
             msg('database'), $maxr->{datname},
-            msg('username'), $maxr->{rolname},
+            msg('username'), $maxr->{usename},
             $maxr->{client_addr} eq '' ? '' : (sprintf ' %s:%s', msg('address'), $maxr->{client_addr}),
             ($maxr->{client_port} eq '' or $maxr->{client_port} < 1)
                 ? '' : (sprintf ' %s:%s', msg('port'), $maxr->{client_port}),