Update copyright headers (#433)

Summary:
Style is modified, so I think it's okay to add
our header there too.
Pull Request resolved: https://github.com/facebook/flipper/pull/433

Differential Revision: D15213091

Pulled By: passy

fbshipit-source-id: c02b67b022f12fdb3e0da39a308d33b073dcb9d3

iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.h

@@ -3,6 +3,7 @@
 //  FlipperKit
 //
 //  Created by Marc Terns on 10/6/18.
+//  Copyright (c) 2018-present, Facebook, Inc.
 //
 
 #import <Foundation/Foundation.h>

iOS/Plugins/FlipperKitUserDefaultsPlugin/FKUserDefaultsSwizzleUtility.m

@@ -4,7 +4,6 @@
 //
 //  Created by Marc Terns on 10/6/18.
 //  Copyright (c) 2018-present, Facebook, Inc.
-//  Copyright (c) 2018-present, Facebook, Inc.
 //
 
 #import "FKUserDefaultsSwizzleUtility.h"

static/style.css

@@ -1,6 +1,7 @@
 /* http://meyerweb.com/eric/tools/css/reset/
    v2.0 | 20110126
    License: none (public domain)
+   Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
 */
 
 html,