Fix AC charger switch state by using numeric system state values #284
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The AC charger system state is stored internally as a numeric enum value, not a mapped string.
The previous switch logic compared the state against string values ("Initializing", "Fault", etc.), which caused the switch to never correctly reflect the charger state.
This change updates is_on_fn to rely on the numeric system state values reported by the charger. Currently treating states 3, 4, and 5 as ON.
This aligns the AC charger switch behavior with how other switches (e.g. plant_start_stop) determine their state.
Verified to work correctly after Modbus refresh on Home Assistant with a Sigenergy EVAC system.