Fix navigation back on phones

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/list/OrderListFragment.kt

@@ -174,7 +174,7 @@ class OrderListFragment :
                             // In this case we need to switch panes – show the list pane instead of details pane.
                             adjustUiForDeviceType(savedInstanceState)
                         } else {
-                            requireActivity().onBackPressedDispatcher.onBackPressed()
+                            findNavController().popBackStack()
                         }
                     }
                 }