Use correct exclude host list

Previously the wrong exlude host list was used
for the target which meant the stop-resume
feature was not working correctly.
The original exlude hosts were used instead of
the original plus the finished hosts.

src/manage.c

@@ -4259,10 +4259,10 @@ launch_osp_openvas_task (task_t task, target_t target, const char *scan_id,
       gchar *new_exclude_hosts;
 
       new_exclude_hosts = g_strdup_printf ("%s,%s",
-                                           exclude_hosts_str,
+                                           clean_exclude_hosts,
                                            finished_hosts_str);
-      free (exclude_hosts_str);
-      exclude_hosts_str = new_exclude_hosts;
+      free (clean_exclude_hosts);
+      clean_exclude_hosts = new_exclude_hosts;
     }
 
   osp_target = osp_target_new (clean_hosts, ports_str, clean_exclude_hosts,