SettingsProvider: fix load protected sms setting logic

The method assumed a string resource, but we are working with
string-arrays.

Change-Id: I7d03821c5f5ac5d24445e5c03f7911c3a81c16dd
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge remote-tracking branch 'cyan/cm-11.0' into cm-11.0