refact: mouse scroll, remote tabs (rustdesk#11708)

Signed-off-by: fufesou <linlong1266@gmail.com>

Author: fufesou

flutter/lib/desktop/widgets/tabbar_widget.dart

@@ -651,7 +651,9 @@ class _DesktopTabState extends State<DesktopTab>
                                     controller.state.value.scrollController;
                                 if (!sc.canScroll) return;
                                 _scrollDebounce.call(() {
-                                  sc.animateTo(sc.offset + e.scrollDelta.dy,
+                                  double adjust = 2.5;
+                                  sc.animateTo(
+                                      sc.offset + e.scrollDelta.dy * adjust,
                                       duration: Duration(milliseconds: 200),
                                       curve: Curves.ease);
                                 });