feat (icons): add icon for danger level air quality

Bump "dead" icon to danger and insert "sick" for severe.

custom_components/tuya_local/icons.json

@@ -269,7 +269,8 @@
                     "good": "mdi:emoticon-happy",
                     "moderate": "mdi:emoticon-neutral",
                     "poor": "mdi:emoticon-sad",
-                    "severe": "mdi:emoticon-dead"
+                    "severe": "mdi:emoticon-sick",
+                    "danger": "mdi:emoticon-dead"
                 }
             },
             "cooking_status": {