Clear data request flag in child_id_req timeout (#1649)

Clear data request flag when returning back to old partition due
child_id_request timeout.

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_host_bootstrap.c

@@ -1035,6 +1035,7 @@ static bool thread_child_id_req_timeout(int8_t interface_id, uint16_t msgId, boo
 
     cur->thread_info->localServerDataBase.release_old_address = false;
     cur->thread_info->releaseRouterId = false;
+    cur->thread_info->networkDataRequested = false;
 
     cur->nwk_bootstrap_state = ER_BOOTSRAP_DONE;