Exclude retired batteries from dashboard warnings

app.py

@@ -95,7 +95,7 @@ def create_app(config_object="config"):
                 and b.tested_capacity_mah < 0.8 * b.capacity_mah
             ],
             "low_pct": [
-                b for b in batteries
+                b for b in active
                 if b.battery_percentage is not None and b.battery_percentage < 20
             ] if ha_client.enabled else [],
         }