Fix buttons in gallery on Apple devices using iOS < 13.x

[andi34]

Fix #185 & #116

From what i found out:

The problem with .click on iOS is that it unbinds the click event."

(...) using 'click touchstart' will get the desired result. If you console.log(e) your clicks though, you may find that when jquery recognizes touch as a click - you will get 2 actions from click and touchstart.

Good read about the problem having 2 actions from click and touchstart: https://stackoverflow.com/questions/7018919/how-to-bind-touchstart-and-click-events-but-not-respond-to-both/36452427#36452427

[sualko]

Do we really want to support legacy devices? At some point you have to make a cut, because otherwise the code will get a mess.

[andi34]

We're using this code in the core.js already in some parts. And right, at some point we might have to stop the support. Since it's not a big change here I think it's okay to keep the support up.

https://github.com/andreknieriem/photobooth/blob/master/resources/js/core.js#L280-L284

https://github.com/andreknieriem/photobooth/blob/master/resources/js/core.js#L507-L509