fix: mock navigator provider param orders (#14)

follow lint rule - sort_child_properties_last

Author: JigneshWorld

lib/src/mock_navigator.dart

@@ -10,8 +10,8 @@ class MockNavigatorProvider extends Navigator {
   /// {@macro mock_navigator_provider}
   const MockNavigatorProvider({
     Key? key,
-    required this.child,
     required this.navigator,
+    required this.child,
   }) : super(key: key);
 
   /// The mock navigator used to mock navigation calls.