fix: analyser issues from later Flutter version (#551)

Author: russellwheatley

packages/firebase_ui_auth/example/windows/runner/main.cpp

@@ -6,7 +6,7 @@
 #include "utils.h"
 
 int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
-                      _In_ wchar_t *command_line, _In_ int show_command) {
+                      _In_ wchar_t* command_line, _In_ int show_command) {
   // Attach to console when present (e.g., 'flutter run') or create a
   // new console when running with a debugger.
   if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {

packages/firebase_ui_database/lib/src/table_builder.dart

@@ -428,7 +428,7 @@ class _PropertyTypeDropdown extends StatelessWidget {
     final localizations = FirebaseUILocalizations.labelsOf(context);
 
     return DropdownButtonFormField<_PropertyType?>(
-      value: formState?.type,
+      initialValue: formState?.type,
       decoration: InputDecoration(labelText: localizations.typeLabel),
       items: [
         DropdownMenuItem(

packages/firebase_ui_firestore/lib/src/table_builder.dart

@@ -547,7 +547,7 @@ class _PropertyTypeDropdown extends StatelessWidget {
     final localizations = FirebaseUILocalizations.labelsOf(context);
 
     return DropdownButtonFormField<_PropertyType?>(
-      value: formState?.type,
+      initialValue: formState?.type,
       decoration: InputDecoration(labelText: localizations.typeLabel),
       items: [
         DropdownMenuItem(

packages/firebase_ui_oauth/lib/src/oauth_provider_button_style.dart

@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 
 import 'package:firebase_ui_shared/firebase_ui_shared.dart';

packages/firebase_ui_shared/lib/src/themed.dart

@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
 /// {@template ui.shared.themed_value}