force_update zwave sensors. (#5844)

* force_update zwave sensors with polling_intensity.

* use bool to cast

* Make all zwave sensors force_update=True

homeassistant/components/sensor/zwave.py

@@ -54,6 +54,11 @@ class ZWaveSensor(zwave.ZWaveDeviceEntity):
         """Initialize the sensor."""
         zwave.ZWaveDeviceEntity.__init__(self, value, DOMAIN)
 
+    @property
+    def force_update(self):
+        """Return force_update."""
+        return True
+
     @property
     def state(self):
         """Return the state of the sensor."""