isine example: remove questionable setting of period size

there is no need to be pedantic about the period size, especially with
a blocking device. what's more, attempting to set it on an already
playing device would error out, and it would be rather counter-
productive to temporarily stop it.

isine.py

@@ -79,7 +79,6 @@ class SinePlayer(Thread):
         while True:
             try:
                 buffer = self.queue.get(False)
-                self.device.setperiodsize(int(len(buffer) / framesize))
                 self.device.write(buffer)
             except Empty:
                 if buffer: