[Merge] lp:~saviq/qtubuntu/revert-occlude-lp1620297 into lp:qtubuntu

[Paweł Stołowski]

Review: Approve

I'm not sure about the overall impact of the change (surely it just restores what we had before, so we should be fine), but +1 from me as it fixes the regression with the Dash (tested with the silo).
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https://code.launchpad.net/~saviq/qtubuntu/revert-occlude-lp1620297/+merge/304976
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