[Merge] lp:~canonical-platform-qa/camera-app/close-panel-helper-fix into lp:camera-app

[Ugo Riboni]

Please make sure this works on all devices, as width * 0.25 might lead to a spot that is on top of an UI element inside the panel on some devices.
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https://code.launchpad.net/~canonical-platform-qa/camera-app/close-panel-helper-fix/+merge/251721
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~canonical-platform-qa/camera-app/close-panel-helper-fix into lp:camera-app.