GUI ScrollBar: possible fix for scrolling

Use of unmodified value returned by 'screen_is_touchscreen' to be used in determening if scroll bar should be scrolled

scene/gui/scroll_bar.cpp

@@ -522,7 +522,7 @@ void ScrollBar::_drag_node_input(const Ref<InputEvent> &p_input) {
 			drag_node_accum = Vector2();
 			last_drag_node_accum = Vector2();
 			drag_node_from = Vector2(orientation == HORIZONTAL ? get_value() : 0, orientation == VERTICAL ? get_value() : 0);
-			drag_node_touching = !DisplayServer::get_singleton()->screen_is_touchscreen(DisplayServer::get_singleton()->window_get_current_screen(get_viewport()->get_window_id()));
+			drag_node_touching = DisplayServer::get_singleton()->screen_is_touchscreen(DisplayServer::get_singleton()->window_get_current_screen(get_viewport()->get_window_id()));
 			drag_node_touching_deaccel = false;
 			time_since_motion = 0;