fix: static analysis fixes to example apps

Author: danvick

packages/flutter_form_builder/example/ios/Runner/Info.plist

@@ -41,5 +41,7 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
 </dict>
 </plist>

packages/flutter_form_builder/example/lib/code_page.dart

@@ -14,10 +14,10 @@ class CodePage extends StatefulWidget {
   }) : super(key: key);
 
   @override
-  _CodePageState createState() => _CodePageState();
+  CodePageState createState() => CodePageState();
 }
 
-class _CodePageState extends State<CodePage> {
+class CodePageState extends State<CodePage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(

packages/flutter_form_builder/example/lib/sources/custom_fields.dart

@@ -6,10 +6,10 @@ class CustomFields extends StatefulWidget {
   const CustomFields({Key? key}) : super(key: key);
 
   @override
-  _CustomFieldsState createState() => _CustomFieldsState();
+  CustomFieldsState createState() => CustomFieldsState();
 }
 
-class _CustomFieldsState extends State<CustomFields> {
+class CustomFieldsState extends State<CustomFields> {
   final _formKey = GlobalKey<FormBuilderState>();
   var options = ["Option 1", "Option 2", "Option 3"];
 

packages/flutter_form_builder/example/lib/sources/signup_form.dart

@@ -6,10 +6,10 @@ class SignupForm extends StatefulWidget {
   const SignupForm({Key? key}) : super(key: key);
 
   @override
-  _SignupFormState createState() => _SignupFormState();
+  SignupFormState createState() => SignupFormState();
 }
 
-class _SignupFormState extends State<SignupForm> {
+class SignupFormState extends State<SignupForm> {
   final _formKey = GlobalKey<FormBuilderState>();
   final _emailFieldKey = GlobalKey<FormBuilderFieldState>();
 

packages/form_builder_extra_fields/example/ios/Runner/Info.plist

@@ -41,5 +41,7 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
 </dict>
 </plist>