Fix GroupMessage subscribing

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/data/EventPacket.kt

@@ -1,19 +0,0 @@
-/*
- * Copyright 2020 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/master/LICENSE
- */
-
-package net.mamoe.mirai.data
-
-import net.mamoe.mirai.event.Event
-
-/**
- * 事件包. 可被监听.
- *
- * @see Event
- */
-interface EventPacket : Event, Packet

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt

@@ -19,7 +19,7 @@ import net.mamoe.mirai.contact.Contact
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member
 import net.mamoe.mirai.contact.QQ
-import net.mamoe.mirai.data.EventPacket
+import net.mamoe.mirai.data.Packet
 import net.mamoe.mirai.event.events.BotEvent
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.utils.*
@@ -37,7 +37,7 @@ expect abstract class MessagePacket<TSender : QQ, TSubject : Contact>(bot: Bot)
  */ // Tips: 在 IntelliJ 中 (左侧边栏) 打开 `Structure`, 可查看类结构
 @Suppress("NOTHING_TO_INLINE")
 @MiraiInternalAPI
-abstract class MessagePacketBase<TSender : QQ, TSubject : Contact>(_bot: Bot) : EventPacket, BotEvent {
+abstract class MessagePacketBase<TSender : QQ, TSubject : Contact>(_bot: Bot) : Packet, BotEvent {
     /**
      * 接受到这条消息的
      */