Fix stale Window AC golden fixture (current_temperature_c, humidity)

PR #75 (WindFree AC) added CURRENT_TEMPERATURE/HUMIDITY capabilities
to the shared airconditioner registry, which every AC device picks up
-- including the Window AC from PR #87. Both branches built their
golden fixtures independently against their own base commit before
either landed, so neither saw the other's addition; once both merged,
the Window AC's fixture went stale. The two extra keys are real,
working sensors from #75's work, not a regression.

tests/fixtures/golden/airconditioner_window_ac.json

@@ -5,10 +5,12 @@
     "alarm_code",
     "auto_clean",
     "climate",
+    "current_temperature_c",
     "display_light",
     "energy_kwh",
     "energy_saved_kwh",
     "firmware_update",
+    "humidity",
     "mute_once",
     "power_watts",
     "selfcheck_error",