DALI lights switching Fix

• DALI lights switching back to "off" ~1-2 min after being turned on. The DALI
  state was polled periodically via WAGO_DALI_GET, but that read returns "off"
  (the query is unreliable, and impossible for DMX at address >= 100), which
  overwrote the real state. In line with Calaos, DALI state is no longer polled in a
  loop: it is read once at startup (and only for genuine DALI addresses 1-64),
  then tracked optimistically. Since the PLC's internal program is suspended, a
  DALI light can only be changed from Home Assistant, so the optimistic state is
  exact.