Fix path of ios module template files (#19037)

* Fix path of ios module template files

* Fix more paths

packages/flutter_tools/lib/src/plugins.dart

@@ -237,7 +237,7 @@ void _writeIOSPluginRegistrant(String directory, FlutterManifest manifest, List<
   if (manifest.isModule) {
     // In a module create the GeneratedPluginRegistrant as a pod to be included
     // from a hosting app.
-    final String registryDirectory = fs.path.join(directory, 'FlutterPluginRegistrant');
+    final String registryDirectory = fs.path.join(directory, 'Flutter', 'FlutterPluginRegistrant');
     final String registryClassesDirectory = fs.path.join(registryDirectory, 'Classes');
     _renderTemplateToFile(
       _iosPluginRegistrantPodspecTemplate,

packages/flutter_tools/templates/module/ios/podhelper.rb.copy.tmpl → packages/flutter_tools/templates/module/ios/Flutter.tmpl/podhelper.rb.copy.tmpl

 # This file should be used from the target section of the host-app's Podfile like this:
 # ```
 # target 'host' do
-#     flutter_application_path = /"(.*)\/.ios\/Generated.xcconfig"/.match(File.read("./Flutter/FlutterConfig.xcconfig"))[1]
-#     eval(File.read(File.join(flutter_application_path, '.ios', 'podhelper.rb')))
+#     flutter_application_path = /"(.*)\/.ios\/Flutter\/Generated.xcconfig"/.match(File.read("./Flutter/FlutterConfig.xcconfig"))[1]
+#     eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')))
 # end
 # ```
 
@@ -34,7 +34,7 @@ system('rm -rf .symlinks')
 system('mkdir -p .symlinks/plugins')
 
 def flutter_root(f)
-    generated_xcode_build_settings = parse_KV_file(File.join(f, File.join('.ios', 'Generated.xcconfig')))
+    generated_xcode_build_settings = parse_KV_file(File.join(f, File.join('.ios', 'Flutter', 'Generated.xcconfig')))
     if generated_xcode_build_settings.empty?
         puts "Generated.xcconfig must exist. Make sure `flutter packages get` is executed in ${f}."
         exit
@@ -74,4 +74,4 @@ plugin_pods.map { |r|
 symlink = File.join('.symlinks', 'FlutterApp')
 File.symlink(File.absolute_path(flutter_application_path), symlink)
 
-pod 'FlutterPluginRegistrant', :path => File.join(symlink, '.ios', 'FlutterPluginRegistrant')
+pod 'FlutterPluginRegistrant', :path => File.join(symlink, '.ios', 'Flutter','FlutterPluginRegistrant')