fix: source of temperature property electric blanket is incorrect

- Use temperature of electric-blanket instead of environment

custom_components/xiaomi_home/miot/specs/specv2entity.py

@@ -251,18 +251,10 @@ SPEC_DEVICE_TRANS_MAP: dict[str, dict | str] = {
                     }
                 },
                 'optional': {
-                    'properties': {'target-temperature'}
+                    'properties': {'target-temperature', 'temperature'}
                 },
             }
         },
-        'optional': {
-            'environment': {
-                'required': {},
-                'optional': {
-                    'properties': {'temperature'}
-                }
-            },
-        },
         'entity': 'heater'
     }
 }