fix: don't error with "Unable to create WibeeeSensor" on unknown keys

[luuuis]

Fixes an error where we try to add an unknown sensor without checking if it should be processed first.

2021-08-25 10:04:21 ERROR (MainThread) [custom_components.wibeee.sensor] Unable to create WibeeeSensor Entities for key fase1_angle and value 0.00
Traceback (most recent call last):
  File "/config/custom_components/wibeee/sensor.py", line 204, in set_sensors
    tmp_sensors.append(WibeeeSensor(self, self.sensor_name_suffix, sensor_id, sensor_phase, sensor_name,sensor_value))
  File "/config/custom_components/wibeee/sensor.py", line 126, in __init__
    friendly_name, unit, device_class = SENSOR_TYPES[sensor_name]
KeyError: 'angle'