apns: Remove defunct Albanian carrier

Why:
- The carrier "Plus" has been disbanded/stopped serving mobile services in 2018.
- Didn't commit this to AOSP since they didn't seem to have Plus as a carrier, plus their list is exteremely outdated.

Change-Id: I1f3e992380fd90d8c85dcc8ead1d98ef65ea900f
(cherry picked from commit ca5ae00)

prebuilt/common/etc/apns-conf.xml

@@ -1134,7 +1134,6 @@
   <apn carrier="Vodafone AL MMS" mcc="276" mnc="02" apn="vfalmms" proxy="" port="" user="" password="" mmsc="http://mmsc.vodafone.al" mmsproxy="10.0.9.2" mmsport="8080" type="mms" />
   <apn carrier="Eagle Mobile" mcc="276" mnc="03" apn="internet" type="default,supl" />
   <apn carrier="Eagle Mobile MMS" mcc="276" mnc="03" apn="mms" mmsc="http://192.168.140.164:38090" mmsproxy="192.168.141.25" mmsport="80" type="mms" />
-  <apn carrier="Plus" mcc="276" mnc="04" apn="plusweb" type="default,supl" />
   <apn carrier="CYTA" mcc="280" mnc="01" apn="cytamobile" mmsc="http://mmsc.cyta.com.cy" mmsproxy="212.31.96.161" mmsport="8080" type="default,supl,mms" />
   <apn carrier="MTN MMS" mcc="280" mnc="10" apn="mms" user="mms" password="mms" mmsc="http://mms.mtn.com.cy/mmsc" mmsproxy="172.24.97.1" mmsport="3130" type="mms" />
   <apn carrier="MTN Internet" mcc="280" mnc="10" apn="internet" type="default,supl" />