system.prop: remove ro.secure=0

...since it doesn't seem to have any effect on what getprop returns

Change-Id: Idb2a805fb32e752297b2e1a40c145b65cccbf5b7
Merge branch 'jb-mv' of git://github.com/Mustaavalkosta/android_device_htc_ace into cm-10.1