[MnbPeoplePanel] Add workaround for MB#6690
[MnbPeoplePanel] Add workaround for MB#6690

We must queue a relayout on the table when show/hide an allocate-hidden=FALSE
child. Changing the row-spacing should do this but it doesn't thus we need to
do it explicitly.

meego-netbook-ux/meego-panel-people,meego-netbook-ux/meego-panel-people