test: fixed use of `client.host` in legacy test: those tests are not maintained anymore, but as the use of `client.host` as been fixed elsewhere, it was the occasion to do it there too. Those legacy tests should be ported or to the new workflow, or deleted if they are not relevant anymore.

# 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()