remove trackpad support in 3.0.5, will revert once upgrade to 3.3

flutter/lib/models/input_model.dart

@@ -264,6 +264,7 @@ class InputModel {
     }
   }
 
+/*
   int _signOrZero(num x) {
     if (x == 0) {
       return 0;
@@ -314,6 +315,7 @@ class InputModel {
 
     trackpadScrollDistance = Offset.zero;
   }
+*/
 
   void onPointDownImage(PointerDownEvent e) {
     debugPrint("onPointDownImage");