bsc: Fix TC_chan_act_ack_est_ind_refused()

This test case was incomplete in that it didn't account for a RLL REL
REQ/RESP before RF_CHAN_REL.

Together with OsmoBSC Change-Id
I64a46b5bcd4272e3fa2ff4ee824c2f3fdff6854b, this test now passes.

Change-Id: Ia5af254d4fc572c1d324f70b5ec99d87bdaf9eb9
1 file changed