fix(iOS): hide fullscreen button in iPhone browser

Full screen in browser is not supported on iPhones so we hide all full screen buttons

see https://caniuse.com/?search=element.requestFullscreen

I tested it on iPhone using Firefox and there is no full screen button.

I tested it on an iPad using Safari and there is a full screen button and it works.

The regex for the mobile detection was taken from http://detectmobilebrowsers.com/

Closes #1882