Replace A1 (232-12) APNs in sample apns file

Replace the old web.yesss.at APN with the brand-neutral webapn.at APN.
Also enable IPV6.

Bug: 215583328
Test: No change to behavior as this is only a sample file
Signed-off-by: Christian Hofstaedtler <christian.hofstaedtler@extern.a1.at>
Change-Id: I7fc2e0a3109e334e620c17ea58fb71ace525ce44
1 file changed