fix: shift + wheel scroll doesn't work

[prayinforrain]

Hi, thank you for such a nice package. I really appreciate it 😁

However I noticed that horizontal scroll with mouse wheel(shift + wheelScroll) doesn't make any scroll, even if there's a handler for it. So I made a small commit to fix it.

I hope this PR will help..

*Tested on MacOS Ventura 13.4, Chrome

[fallenleavesguy]

@prayinforrain your new code is work on osx system.but on window, it should use deltaY.

I can offer a demo code

        const isMac = /Mac/i.test(navigator.userAgent);

        let dx = isScrollingHorizontally ? (isMac ? deltaX : deltaY) : deltaX;