[pigeon] Fully-quality types in Equatable extension test

Author: jmagman

packages/pigeon/platform_tests/test_plugin/example/ios/Runner/AppDelegate.swift

@@ -5,7 +5,7 @@
 import Flutter
 import UIKit
 
-@UIApplicationMain
+@main
 @objc class AppDelegate: FlutterAppDelegate {
   override func application(
     _ application: UIApplication,

packages/pigeon/platform_tests/test_plugin/example/ios/RunnerTests/EnumTests.swift

@@ -12,7 +12,7 @@ class MockEnumApi2Host: EnumApi2Host {
   }
 }
 
-extension DataWithEnum: Equatable {
+extension test_plugin.DataWithEnum: Swift.Equatable {
   public static func == (lhs: DataWithEnum, rhs: DataWithEnum) -> Bool {
     lhs.state == rhs.state
   }