bugfix: reset DCI count before adding one
The management of uplink failure generates a DCI to send a RA PDCCH order. It calls add_ue_spec_dci which increases DCI_pdu[CC_id]->Num_ue_spec_dci, but this was reset to 0 *after* the DCI generation. Let's reset *before*. Bug reported by Liang Yong on openair5g-user mailing list.