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Fix NavigationDrawer selected item has wrong icon color (#129625 )

fixes [NavigationDrawer selected item has wrong icon color [Material3 spec]](https://github.com/flutter/flutter/issues/129572)

### Description
This PR fixes a mistake in the `NavigationDrawer` defaults, where generated token value returns a `null`. 
This issue can be detected when you want to customize the selected icon color for `NavigationDrawerDestination` using a custom color scheme.

### Code sample

<details> 
<summary>expanded to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      themeMode: ThemeMode.light,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue).copyWith(
          onSecondaryContainer: Colors.red,
        ),
        useMaterial3: true,
      ),
      home: const Example(),
    );
  }
}

class Example extends StatelessWidget {
  const Example({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('NavigationDrawer Sample'),
      ),
      drawer: const NavigationDrawer(
        children: <Widget>[
          NavigationDrawerDestination(
            icon: Icon(Icons.favorite_outline_rounded),
            label: Text('Favorite'),
            selectedIcon: Icon(Icons.favorite_rounded),
          ),
          NavigationDrawerDestination(
            icon: Icon(Icons.favorite_outline_rounded),
            label: Text('Favorite'),
          ),
        ],
      ),
    );
  }
}
``` 
	
</details>

### Before
 
<img width="1053" alt="Screenshot 2023-06-27 at 13 24 38" src="https://github.com/flutter/flutter/assets/48603081/18c13a73-688f-4586-bb60-bddef45d173f">

### After

<img width="1053" alt="Screenshot 2023-06-27 at 13 24 25" src="https://github.com/flutter/flutter/assets/48603081/8a1427c6-517f-424a-b0bd-24bad7c5fbb0">

2023-06-30 08:58:14 +00:00

bin

Improve defaults generation with logging, stats, and token validation (#128244 )

2023-06-09 11:28:18 +00:00

data

Run dart command to update widget defaults (#122557 )

2023-03-15 18:53:29 +01:00

generated

Fix NavigationDrawer selected item has wrong icon color (#129625 )

2023-06-30 08:58:14 +00:00

lib

Fix NavigationDrawer selected item has wrong icon color (#129625 )

2023-06-30 08:58:14 +00:00

test

Improve defaults generation with logging, stats, and token validation (#128244 )

2023-06-09 11:28:18 +00:00

pubspec.yaml

flutter update-packages --force-upgrade (#128908 )

2023-06-15 18:17:09 +00:00

README.md

Improve defaults generation with logging, stats, and token validation (#128244 )

2023-06-09 11:28:18 +00:00

test.json

Improve defaults generation with logging, stats, and token validation (#128244 )

2023-06-09 11:28:18 +00:00

README.md

Token Defaults Generator

Script that generates component theme data defaults based on token data.

Usage

Run this program from the root of the git repository:

dart dev/tools/gen_defaults/bin/gen_defaults.dart [-v]

This updates generated/used_tokens.csv and the various component theme files.

Templates

There is a template file for every component that needs defaults from the token database. These templates are implemented as subclasses of TokenTemplate. This base class provides some utilities and a structure for adding a new block of generated code to the bottom of a given file.

Templates need to override the generate method to provide the generated code block as a string.

See lib/fab_template.dart for an example that generates defaults for the Floating Action Button.

Tokens

Tokens are stored in JSON files in data/, and are sourced from an internal Google database.

template.dart should provide nearly all useful token resolvers (e.g. color, shape, etc.). For special cases in which one shouldn't be defined, use getToken to get the raw token value. The script, through the various revolvers and getToken, validates tokens, keeps track of which tokens are used, and generates generated/used_tokens.csv.