Upgrade deps, format, fix web/filipino_cuisine (#898)

fixes: https://github.com/flutter/samples/issues/897

web/filipino_cuisine/lib/flutter_swiper.dart

@@ -3,8 +3,8 @@
 
 import 'dart:async';
 
-import 'package:flutter/material.dart';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
 
 import 'flutter_page_indicator.dart';
 import 'transformer_page_view.dart';

web/filipino_cuisine/lib/main.dart

@@ -8,13 +8,19 @@ import 'flutter_swiper.dart';
 void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
+  final _themeData = ThemeData(
+    brightness: Brightness.light,
+    iconTheme: const IconThemeData(color: Colors.red),
+  );
+
   @override
   Widget build(context) {
     return MaterialApp(
-        theme: ThemeData(
-            brightness: Brightness.light,
-            accentColor: Colors.red,
-            iconTheme: const IconThemeData(color: Colors.red)),
+        theme: _themeData.copyWith(
+          colorScheme: _themeData.colorScheme.copyWith(
+            secondary: Colors.red,
+          ),
+        ),
         title: "Filipino Cuisine",
         home: Home());
   }
@@ -123,7 +129,7 @@ class HState extends State<Home> {
             context,
             MaterialPageRoute(
                 builder: (cx) => Cook(
-                      fi['in'] as List<String>,
+                      (fi['in'] as List).cast(),
                       fi['pf'] as String,
                       fi['fn'] as String,
                     ))),