TT#45455 fix reading multiple cdredit_warnings configs

Change-Id: I88259bd84f3ea44be97822e70e82f369b49da57d
(cherry picked from commit ab9bf2f555)

bin/ngcp-credit-warning

@@ -52,7 +52,7 @@ sub usage {
 }
 
 sub load_config {
-    $config = XML::Simple->new()->XMLin($config_file, ForceArray => 0)
+    $config = XML::Simple->new()->XMLin($config_file, ForceArray => [ 'credit_warnings' ])
         or die "Cannot load config: $config_file: $ERRNO";
     return;
 }