[Fix] Fix memory leak in address parsing for *-any addresses

[Fix] Fix memory leak in address parsing for *-any addresses

In rspamd_parse_host_port_priority(), when handling '*' (any address),
the GPtrArray was created with a conditional destructor:

    pool == NULL ? NULL : (GDestroyNotify) rspamd_inet_address_free

This meant that when pool == NULL, the array had NO destructor for
elements. Later, when rspamd_upstreams_add_upstream() copied addresses
and called g_ptr_array_free(addrs, TRUE), the original address objects
were not freed, causing a memory leak.

Fix: Always set the destructor to rspamd_inet_address_free, regardless
of pool presence. The destructor will properly free address elements
when the array is freed, while mempool destructor (if pool exists)
will handle freeing the array itself.