Negative ARO timeout use same timeout than not trusted device.

Change-Id: I28e25de3213edcde46b6b25bf87248162067cf4f

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_common.c

@@ -407,7 +407,7 @@ bool ws_common_negative_aro_mark(protocol_interface_info_entry_t *interface, con
     }
     ws_neighbor_class_entry_t *ws_neighbor = ws_neighbor_class_entry_get(&interface->ws_info->neighbor_storage, neighbour->index);
     ws_neighbor->negative_aro_send = true;
-    neighbour->lifetime = 30; //Remove anyway if Packet is freed before MAC push
+    neighbour->lifetime = WS_NEIGHBOR_NOT_TRUSTED_LINK_TIMEOUT; //Remove anyway if Packet is freed before MAC push
     return true;
 }