fix(morento_hy4866_wf): correct value mappings

- preset_mode Auto is accepted by the device, but reported as auto (lower case)
- air quality reports unhealthy, which was not handled.

Comment on #2581

custom_components/tuya_local/devices/morento_hy4866_wf.yaml

@@ -17,7 +17,7 @@ entities:
         mapping:
           - dps_val: sleep
             value: sleep
-          - dps_val: Auto
+          - dps_val: auto
             value: smart
           - dps_val: 1F
             value: low
@@ -85,5 +85,7 @@ entities:
             value: good
           - dps_val: medium
             value: moderate
+          - dps_val: unhealthy
+            value: poor
           - dps_val: severe
             value: severe