piket_client: Remove dependency on `simpleaudio`

piket_client/shell.nix

     pyside2
     qdarkstyle
     requests
-    simpleaudio
     dbus-python
 
     raven

setup.py

     extras_require={
         "dev": ["black", "pylint"],
         "server": ["Flask", "SQLAlchemy", "Flask-SQLAlchemy", "alembic", "uwsgi"],
-        "client": ["PySide2", "qdarkstyle>=2.6.0", "requests", "simpleaudio"],
+        "client": ["PySide2", "qdarkstyle>=2.6.0", "requests"],
         "osk": ["dbus-python"],
         "sentry": ["raven"],
     },