quick_frontend (contact list): fixed `nick` use for groupchat: during the profile connection workflow, joined rooms are retrieved, then presence are filled, all asynchronously. In some cases, all rooms may not be joined when presence are filled, resulting in cache being already filled with a `nick` when cache is set for the room itself. Because of that, a `nick` may be displayed in contact list instead of MUC local part. This patch fixes it by removing `nick` if it exists when cache a MUC room. fix 305

# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
# TODO: remove this when changes are merged in Wokkel
from sat_tmp.wokkel import install
install()