Disable Cmd-W and Cmd-Q on the UTM window

**Describe the issue**

Cmd-W and Cmd-Q both go to the UTM to close the window or quit UTM.

Both of these are used very frequently in my guest OS and I don't really use or need them to close or quit UTM.

Capturing the mouse works, but it is annoying to have to do as I work in both host and guest simultaneously.

It would be great to have an option to disable Cmd-W and Cmd-Q on the UTM window so they pass through to the guest.

**Configuration**
* UTM Version: 4.2.5
* macOS Version: 13.4.1
* Mac Chip (Intel, M1, ...): Intel