[PATCH pmg-api] fix missing postfix welcomelist update

[Dominik Csapak <d.csapak@proxmox.com>]

Similar fix as
 17f17bc (config: do not shortcircuit smtp-welcomelist generation)

If `$changes` is already true, 'rewrite_postfix_welcomelist' will never
called.

This prevented those file generation on first boot after a fresh
install.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
I tested the previous fix only after rebooting the machine, not on a new
installation so I missed this.

This time I installed fresh (in debug mode) and injected the changes
into the file after the installation finished, but before a reboot and
it worked now. Sorry, I could have caught this the first time around...

 src/PMG/Config.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PMG/Config.pm b/src/PMG/Config.pm
index f48c31d..9b22b67 100644
--- a/src/PMG/Config.pm
+++ b/src/PMG/Config.pm
@@ -1916,7 +1916,7 @@ sub rewrite_config_postfix {
     postmap_tls_policy();
     postmap_tls_inbound_domains();
 
-    $changes ||= rewrite_postfix_welcomelist($rulecache) if $rulecache;
+    $changes = 1 if $rulecache && rewrite_postfix_welcomelist($rulecache);
 
     # make sure aliases.db is up to date
     system('/usr/bin/newaliases');
-- 
2.47.3