Bug 1875118: Group label filter correctly

When on 'All groups' list and clicking a label we now get taken to
'All my groups' as only ones own groups can have labels and the
filtering takes place there.

Change-Id: I1bf5af0e37fe1a189b2700bae3137d2fd87de283
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>