Update apns-conf.xml

I changed the APN type for Telenor Serbia provider. APN type was set to "default,supl,mms" for both internet and mms. I had to change this manualy since I am using CyanogenMod (CM7) and it is causing of sending mms to get stuck forever.
I just set APN type for internet to "default,supl" and for mms just "mms"

Just one note. This is my first time using github and I have some issue which I am not sure if it is mine problem.
I changed only the lines in 137 and 138. But after commiting I see that 3 more lines are changed also and they look like they are messed up. I havent changed those and already tried this twice and second time also some lines are changed. 
Changed like which are not mine and look broken are 489, 719 and 976.