Increase scrolling speed with the touchpad

Currently, scrolling through a document using the touchpad is quite slow compared to scrolling through the standard Qt controls. This MR increases the speed of scrolling with the touchpad by removing the "magic" divider.

CCBUG: 455014

part/pageview.cpp

@@ -3300,7 +3300,7 @@ void PageView::wheelEvent(QWheelEvent *e)
                     slotScrollUp(count);
                 }
             } else {
-                d->scroller->scrollTo(d->scroller->finalPosition() - e->angleDelta() * multiplier / 4.0, 0);
+                d->scroller->scrollTo(d->scroller->finalPosition() - e->angleDelta() * multiplier, 0);
             }
         }
     }