fix extended controls: xchangeproperty unexpected keyord arg
Traceback (most recent call last):
File "/[...]/python3.5/site-packages/tooncher/__init__.py", line 162, in launch
toggle_keysym_name=extended_keyboard_control_toggle_keysym_name,
File "/[...]/python3.5/site-packages/tooncher/controls.py", line 151, in run
mode=X.PropModeReplace,
TypeError: change_property() got an unexpected keyword argument 'property_type'