(maint) Fix variable scope for systemd-override

$manage_package_repo wasn't in scope. This was causing all RHEL7 systems with
manage_package_repo on to fail on startup using systemctl, since the template
systemd-override.erb relies on that variable in a conditional, to ensure the
correct PGDG path is set.

Signed-off-by: Ken Barber <ken@bob.sh>

manifests/server/config.pp

@@ -14,6 +14,7 @@
   $user                       = $postgresql::server::user
   $group                      = $postgresql::server::group
   $version                    = $postgresql::server::_version
+  $manage_package_repo        = $postgresql::server::manage_package_repo
   $manage_pg_hba_conf         = $postgresql::server::manage_pg_hba_conf
   $manage_pg_ident_conf       = $postgresql::server::manage_pg_ident_conf
   $manage_recovery_conf       = $postgresql::server::manage_recovery_conf