groups-12792 test: remove unused function
groups-12792 test: remove unused function

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=69618
Reviewed-by: Guillaume Desmottes <f16649c7afcd84e3350287183c4ed23cb1aea57c@collabora.co.uk>

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble