DALI Light 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.