Copy and Paste uses ctrl+c/ctrl+v by default and cannot be changed

I have read the [FAQ](https://github.com/Genymobile/scrcpy/blob/master/FAQ.md).
I have searched in existing [issues](https://github.com/Genymobile/scrcpy/issues).

**Environment**
- OS: macOS 11 Big Sur
- scrcpy version: 1.16
- installation method: Brew
- device model: Huawei Mate 20 Pro
- Android version: 10

**Describe the bug**
I use a mac, so copy and paste is carried out by cmd+c/cmd+v. When using scrcpy, it uses ctrl+c/ctrl+v instead, and this gets annoying. I have already attempted changing the shortcut modifier key using the following terminal codes:`scrcpy --shortcut-mod=lctrl`, `scrcpy --shortcut-mod=lctrl+lalt,lsuper`, `scrcpy --shortcut-mod=lsuper`, `scrcpy --shortcut-mod=lalt`, but it's still using ctrl+c/ctrl+v for copy paste.