Use command+option for input capture/release doesn't release capture

**Describe the issue**
In full screen mode, once input for a macOS guest is captured, the only way to release capture is to minimize the UTM window, as cmd+opt does not release input to the host macOS.

(In my host macOS, Dock is automatically hidden. If I can force Dock to appear--which doesn't always work when UTM is in full screen mode--I can select an app from my host macOS, and the app will open and release keyboard control to the host macOS. This is rather brute-force and is not as reliable as minimizing UTM.)

**Configuration**
* UTM Version: 4.6.3
* Host macOS Version: 14.7.1
* Guest macOS Version: 14.7.1 or 15.1.1 or 15.2 (basically, all 13.x or later versions which I have tested)
* Mac Chip (Intel, M1, ...): M2 Max 96GB

**Crash log**
N/A

**Debug log**
N/A

**Upload VM**
N/A