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demos/demo_onset.py: simplify imports

--- a/python/demos/demo_onset.py

+++ b/python/demos/demo_onset.py

@@ -1,8 +1,7 @@

 #! /usr/bin/env python

 import sys

-from aubio import onset, source

-from numpy import array, hstack, zeros

+from aubio import source, onset

 win_s = 512                 # fft size

 hop_s = win_s / 2           # hop size