fix(sensor): removes resolution from fetch one response to only retur… (

#779)

* fix(sensor): removes resolution from fetch one response to only return event_resolution

Signed-off-by: GustaafL <guus@seita.nl>

* docs(sensor): correct example response in docstring fetch_one

Signed-off-by: GustaafL <guus@seita.nl>

---------

Signed-off-by: GustaafL <guus@seita.nl>

flexmeasures/api/v3_0/sensors.py

@@ -516,7 +516,7 @@ def fetch_one(self, id, sensor):
                 "name": "some gas sensor",
                 "unit": "m³/h",
                 "entity_address": "ea1.2023-08.localhost:fm1.1",
-                "event_resolution": 10,
+                "event_resolution": "PT10M",
                 "generic_asset_id": 4,
                 "timezone": "UTC",
             }
@@ -531,7 +531,6 @@ def fetch_one(self, id, sensor):
         :status 422: UNPROCESSABLE_ENTITY
         """
 
-        sensor.resolution = sensor.event_resolution
         return sensor_schema.dump(sensor), 200
 
     @route("", methods=["POST"])