Prevents scroll jump on iOS when using "data-clipboard-text"

Thanks to @geraldarthur at #369

src/clipboard-action.js

@@ -64,7 +64,6 @@ class ClipboardAction {
         this.fakeElem.style[ isRTL ? 'right' : 'left' ] = '-9999px';
         // Move element to the same position vertically
         let yPosition = window.pageYOffset || document.documentElement.scrollTop;
-        this.fakeElem.addEventListener('focus', window.scrollTo(0, yPosition));
         this.fakeElem.style.top = yPosition + 'px';
 
         this.fakeElem.setAttribute('readonly', '');