fix: API v3 Page update

[maeshinshin]

task: https://redmine.weseek.co.jp/issues/153149

farai 追記) 失敗していた原因

• user が所属するグループを取得する部分で、user._id ではなく user.id を使用してしまっている
• GROWI のアプリからのリクエストだと id メソッドはインスタンスに存在するが、access_token を使った API を直接叩く方法だと、id メソッドが取り除かれる: https://github.com/weseek/growi/blob/d7935a660becf1faeaac8ac7d62b14a96d21a67d/apps/app/src/server/middlewares/access-token-parser.js#L29

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