Detect scrollbar and resize photowall

[oparoz]

From @oparoz on October 9, 2015 17:24

The scrollbar is eating away something like 20-30 pixels of each image on Firefox, so let's see if we can detect it and refresh the page.

This will only be accepted if it doesn't feel too bizarre when reloading the page when the thumbnails reach the bottom of the screen. It should only be a brief flash to re-adjust the view.

I have one slight concern regarding albums, because thumbnails might be re-loaded...

Experiment and see!

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Copied from original issue: owncloud/gallery#417