fix(dishwasher): model delay start as a duration, not a wall-clock time

x.com.samsung.da.delayStartTime is HH:MM:SS until the cycle starts
(e.g. "01:00" means 1 hour from pressing start), not a time of day. It
was wired up as a time entity with a suspicious hour % 24 wrap -- a
sign it was never really a clock time. Replace with a number entity
(0-24h, 1h steps) that reads/writes the field as elapsed hours.

tests/fixtures/golden/dishwasher.json

@@ -5,7 +5,7 @@
     "child_lock",
     "cycle",
     "cycle_active",
-    "delay_start_time",
+    "delay_start_hours",
     "diagnosis_status",
     "energy_kwh",
     "finish_time",
@@ -36,7 +36,7 @@
     "samsung_dishwasher_child_lock",
     "samsung_dishwasher_cycle",
     "samsung_dishwasher_cycle_active",
-    "samsung_dishwasher_delay_start_time",
+    "samsung_dishwasher_delay_start_hours",
     "samsung_dishwasher_diagnosis_start",
     "samsung_dishwasher_diagnosis_status",
     "samsung_dishwasher_energy_kwh",