fix: vpn-router-setup runs on a new installation once libpq can be found.

debian-package/src/usr/lib/vpn-router/wait-for-libpq

@@ -1,6 +1,7 @@
 #!/bin/sh
 # Wait until libpq is in the dynamic linker cache, where psycopg looks it up.
-# ExecStartPre= of vpn-router-web.service; TimeoutStartSec= of the unit bounds the wait.
+# ExecStartPre= of vpn-router-setup.service, vpn-router-web.service and vpn-router-metrics.service;
+# TimeoutStartSec= of the unit bounds the wait.
 
 reported=
 until ldconfig -p | grep -q '^[[:space:]]*libpq\.so\.5 '; do