[Merge] lp:~dandrader/qtubuntu/logicalDpi into lp:qtubuntu

[Daniel d'Andrada]

> But realistically the battery usage image in System Settings is the only one I
> really care about. If we break that, we should fix it.

Didn't spot any visual differences in this application with and without this patch.
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https://code.launchpad.net/~dandrader/qtubuntu/logicalDpi/+merge/320940
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