mac_controller: after maxRetx disable ALL UE bearers

the reasoning here is that the only way to recover
from the maxRetx event is the UE attempting a reestablishment.

No further traffic, neither control nor data is scheduled
until then.

srsenb/src/stack/rrc/mac_controller.cc

@@ -299,8 +299,10 @@ void mac_controller::handle_ho_prep(const asn1::rrc::ho_prep_info_r8_ies_s& ho_p
 
 void mac_controller::handle_max_retx()
 {
-  set_drb_activation(false);
-  update_mac(other);
+  for (auto& ue_bearer : current_sched_ue_cfg.ue_bearers) {
+    ue_bearer.direction = sched_interface::ue_bearer_cfg_t::IDLE;
+  }
+  update_mac(config_tx);
 }
 
 void mac_controller::set_scell_activation(const std::bitset<SRSRAN_MAX_CARRIERS>& scell_mask)