[Merge] lp:~phablet-team/messaging-app/mms_settings into lp:messaging-app/staging

[Roberto Mier Escandón ]

Review: Needs Fixing

I cannot maintain the "Enable MMS messages" setting enabled. Once i leave Settings page it gets disabled. When reentering in settings i see it disabled and it is indeed that way since i cannot create a MMS group
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https://code.launchpad.net/~phablet-team/messaging-app/mms_settings/+merge/310582
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