test: enabled switch is a FormulaMetric — entity_id keeps the doubled prefix

test_sensor_complex[complex_naming] expected the de-duplicated entity_id for the
schedule 'enabled' switch, but that entity is a WritableFormulaMetric: formula
metrics are created without a display_id, so display_id == unique_id and the
device-type prefix is NOT de-duplicated (system_0_system_ess..., like the energy
FormulaMetric). The 'Day' select is a plain topic metric and stays de-duplicated.
Fixes the StopIteration (no entity matched the expected id).

Author: pos-ei-don

tests/test_hub.py

@@ -381,8 +381,12 @@ async def test_sensor_complex(
         day_entity_id = "select.victron_venus_ess_batterylife_schedule_charge_2_days"
         enabled_entity_id = "switch.victron_venus_ess_batterylife_schedule_charge_2_enabled"
     else:
+        # The "Day" select is a plain topic metric, so its display_id de-duplicates
+        # the device-type prefix (system_system -> system). The "enabled" switch is
+        # a (writable) FormulaMetric, which has no display_id and keeps the full
+        # unique_id (doubled system_ prefix) — so its entity_id is NOT de-duplicated.
         day_entity_id = "select.victron_mqtt_123_system_0_ess_schedule_charge_2_days"
-        enabled_entity_id = "switch.victron_mqtt_123_system_0_ess_schedule_charge_2_enabled"
+        enabled_entity_id = "switch.victron_mqtt_123_system_0_system_ess_schedule_charge_2_enabled"
 
     day_entity = next(entity for entity in entities if entity.entity_id == day_entity_id)
     enabled_entity = next(