fix(vevor_yt60307_weather_station): use correct speed units

Issue #4906

custom_components/tuya_local/devices/vevor_yt60307_weather_station.yaml

@@ -49,7 +49,7 @@ entities:
       - id: 112
         type: integer
         name: sensor
-        unit: kph
+        unit: "km/h"
         class: measurement
         mapping:
           - scale: 10
@@ -60,7 +60,7 @@ entities:
       - id: 132
         type: integer
         name: sensor
-        unit: kph
+        unit: "km/h"
         class: measurement
         mapping:
           - scale: 10