APN: Remove wrong T-Mobile CZ and Vodafone CZ APNs

There are two T-Mobile CZ APNs which specify the MMS proxy as http
proxy (which doesn't work). Get rid of them, there are correct APNs
available. Also remove duplicate IMS and wrong MMS APN.

Remove two wrong and one deprecated Vodafone CZ APNs. The separate
'ointernet' APN for prepaid cards has been deprecated since 2010.

Change-Id: Idf8e7c8df7bb843cdfafe7dbce710d09aa47eda1