[Merge] lp:~fboucault/qtubuntu-camera/prevent_camera_switching_at_ui_level into lp:qtubuntu-camera

[Jim Hodapp]

Review: Approve code

Florian indicated that the camera-app controls disappearing on flo are a known bug and unrelated to this MR. Approving
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https://code.launchpad.net/~fboucault/qtubuntu-camera/prevent_camera_switching_at_ui_level/+merge/228479
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