api/pupdevices/UltrasonicSensor: drop silent

Like its EV3 counterpart, this does not work reliably enough, so remove.

pybricks/pupdevices.py

@@ -244,15 +244,10 @@ class UltrasonicSensor:
         """
         pass
 
-    def distance(self, silent=False):
+    def distance(self):
         """Measures the distance between the sensor and an object using
         ultrasonic sound waves.
 
-        Arguments:
-            silent (bool): Choose ``True`` to turn the sensor off after
-                           measuring the distance. This reduces interference
-                           with other ultrasonic sensors.
-
         Returns:
             :ref:`distance`: Distance.
 
@@ -263,10 +258,6 @@ class UltrasonicSensor:
         """Checks for the presence of other ultrasonic sensors by detecting
         ultrasonic sounds.
 
-        If the other ultrasonic sensor is operating in silent mode, you can
-        only detect the presence of that sensor while it is taking a
-        measurement.
-
         Returns:
             bool: ``True`` if ultrasonic sounds are detected,
             ``False`` if not.