Update switch template (#120919)

dev/tools/gen_defaults/lib/switch_template.dart

@@ -85,6 +85,19 @@ class _${blockName}DefaultsM3 extends SwitchThemeData {
     });
   }
 
+  @override
+  MaterialStateProperty<Color?> get trackOutlineColor {
+    return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
+      if (states.contains(MaterialState.selected)) {
+        return Colors.transparent;
+      }
+      if (states.contains(MaterialState.disabled)) {
+        return ${componentColor('md.comp.switch.disabled.unselected.track.outline')}.withOpacity(${opacity('md.comp.switch.disabled.track.opacity')});
+      }
+      return ${componentColor('md.comp.switch.unselected.track.outline')};
+    });
+  }
+
   @override
   MaterialStateProperty<Color?> get overlayColor {
     return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
@@ -187,19 +200,6 @@ class _SwitchConfigM3 with _SwitchConfig {
   @override
   double get trackHeight => ${tokens['md.comp.switch.track.height']};
 
-  @override
-  MaterialStateProperty<Color?> get trackOutlineColor {
-    return MaterialStateProperty.resolveWith((Set<MaterialState> states) {
-      if (states.contains(MaterialState.selected)) {
-        return null;
-      }
-      if (states.contains(MaterialState.disabled)) {
-        return ${componentColor('md.comp.switch.disabled.unselected.track.outline')}.withOpacity(${opacity('md.comp.switch.disabled.track.opacity')});
-      }
-      return ${componentColor('md.comp.switch.unselected.track.outline')};
-    });
-  }
-
   @override
   double get trackWidth => ${tokens['md.comp.switch.track.width']};