fix(glightbox.js): remove background focus, fix issue #555 #557
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Fixes issue #555: To fix "Blocked aria-hidden on an element because its descendant retained focus..." error on chrome. The issue is the original thumbnail retaining focus despite being aria-hidden, once modal opens.
Drawback is the original focus position is lost. Therefore there is a better solution to store original focus position and restore it when modal is closing.
Not tested in IE, but sure OK.