Fix text appearing twice after Chinese character input (#14558)

Release Notes:

- Fixed the issue where text appears twice in the editor after Chinese
Character input.([linux: Fix IME on
fcitx](https://github.com/zed-industries/zed/pull/14508)).

Before：

![zed2](https://github.com/user-attachments/assets/e387d70b-ca91-49c8-93e4-850f9e3ef227)

After Fixed：

![zed](https://github.com/user-attachments/assets/8307c12f-30a7-4e82-8c65-d0b53bb8cf44)