[Merge] lp:~phablet-team/camera-app/hdr-flash-mutually-exclusive into lp:camera-app

[Florian Boucault]

Review: Needs Fixing

It is not enough to set the right values, the values that should not be possible should be made unavailable to the user as well (options disabled in the UI).
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https://code.launchpad.net/~phablet-team/camera-app/hdr-flash-mutually-exclusive/+merge/245010
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