Fix Proxy error for plyer.facades.audio.__init__
Fix Proxy error for plyer.facades.audio.__init__

ref https://github.com/kivy/plyer/blob/931bf868c38b090237d1af8955a7b0d4e39d1408/plyer/utils.py#L94, the `__init__` kwargs are empty, so switching to default value instead, otherwise it breaks the docs on RTD.
kivy/plyer,kivy/plyer,KeyWeeUsr/plyer,kivy/plyer,KeyWeeUsr/plyer,KeyWeeUsr/plyer