修复 RoomInfoManager.CurrentGroupInfo 不正确的问题

[natsurainko]

PR-Codex overview

This PR focuses on refactoring the handling of group user state changes in the ConnectX.Client/Client.cs file, streamlining the logic for acquiring group information and resetting the room state based on user states.

Detailed summary

• Removed redundant checks for group user states.
• Combined cases for GroupUserStates.Left, Disconnected, and Kicked into a single conditional statement.
• Simplified the logic for resetting room state and acquiring group info based on user state.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}