修正了以下兩個錯誤

The following two issues have been fixed:

1.

修正開啟直播前的預覽畫面黑頻，看不到自己的預覽的錯誤

Fix the issue where the preview screen appears black before starting a live stream, preventing creators from seeing their preview.

2.

創作者開啟直播後，可以在自己的頻道最上方看到 “我正在直播” 的按鈕，點選後可以進入直播間

After starting a live stream, creators should see a "I'm Live" button at the top of their channel, which they can click to enter the live room.