Postgres fallback port resolution fix

Signed-off-by: itowlson <ivan.towlson@fermyon.com>

Author: itowlson

crates/factor-outbound-pg/src/host.rs

@@ -61,7 +61,7 @@ impl<CF: ClientFactory> InstanceState<CF> {
                     let port =
                         ports
                             .get(i)
-                            .or_else(|| if ports.len() == 1 { ports.get(1) } else { None });
+                            .or_else(|| if ports.len() == 1 { ports.get(0) } else { None });
                     let port_str = port.map(|p| format!(":{p}")).unwrap_or_default();
                     let url = format!("{address}{port_str}");
                     if !self