relay: fix typo in comment
relay: fix commands sync/desync in weechat protocol (bug #38215)

Fix:
- use proper arguments in commands sync/desync (use argv[0] instead of argv[1])
- when searching if a buffer is synchronized, its name has higher priority on "*"
  (so first check if buffer is synchronized, and if not found, search if "*" is
  synchronized)
- when receiving a "nicklist_*" signal, check if the buffer is synchronized with
  flag "RELAY_WEECHAT_PROTOCOL_SYNC_NICKLIST"