Panning does not work on mobile chrome

[jokerttu]

Mobile mediaquery hides the viewFinder. Move logic is under viewFinder code and it uses viewFinder height and width for calculations. When viewFinder is hidden browser gives 0 for width and height -> panning won't work.
Logic need to be changed so that the panning is done on image space and viewFinder is updated (if visible)

For fast fix I just changed the mediaquery so that viewFinder is always visible but just drawn outside of the view.
@media screen and (max-width: 767px) {
.iv-snap-view {
top: -9999px;
}
}

[s-yadav]

Thanks @jokerttu

Needed a css change only, updated to

.iv-snap-view {
   z-index : -1;
   visibility:hidden;
}