apns: NOS does not use DUN

Pre-paid internet-only ("Kanguru Livre") NOS cards do not work with the
current configuration, so remove DUN which is not used anyway.

Signed-off-by: Simão Gomes Viana <devel@superboring.dev>

prebuilt/common/etc/apns-conf.xml

@@ -1065,7 +1065,7 @@
   <apn carrier="Vodafone PT Internet" mcc="268" mnc="01" apn="net2.vodafone.pt" proxy="iproxy.vodafone.pt" port="80" mmsc="http://mms.vodafone.pt/servlets/mms" mmsproxy="iproxy.vodafone.pt" mmsport="80" type="default,supl,mms" />
   <apn carrier="Vodafone PT WAP MMS" mcc="268" mnc="01" apn="vas.vodafone.pt" user="vas" password="vas" mmsc="http://mms/servlets/mms" mmsproxy="213.30.27.63" mmsport="8799" type="mms" />
   <apn carrier="Vodafone PT WAP" mcc="268" mnc="01" apn="wap.vodafone.pt" user="wap" password="wap" proxy="172.16.19.50" port="8799" type="default,supl" />
-  <apn carrier="NOS/WTF Internet" mcc="268" mnc="03" apn="umts" type="default,supl,dun" />
+  <apn carrier="NOS/WTF Internet" mcc="268" mnc="03" apn="umts" type="default,supl" />
   <apn carrier="NOS MMS" mcc="268" mnc="03" apn="mms" mmsc="http://mmsc:10021/mmsc" mmsproxy="62.169.66.5" mmsport="8799" authtype="1" type="mms" />
   <apn carrier="WTF MMS" mcc="268" mnc="03" apn="umts" mmsc="http://mmsc:10021/mmsc" mmsproxy="62.169.66.5" mmsport="8799" authtype="1" type="mms" />
   <apn carrier="Lycamobile PT" mcc="268" mnc="04" apn="data.lycamobile.pt" user="lmpt" password="plus" type="default,supl"/>