Fix Simple APN

Per http://www.mysimplemobile.com/Support-Center-Phone-Programming.aspx
Proxy and MMS proxy are not valid for this APN. Additionally, though
an invalid report (nightly), this has been reported at
https://jira.cyanogenmod.org/browse/CYAN-156

Change-Id: Id7a9e7af1a764e6052f312bf66d01d225554918b