Display Resolution HiDPI has no effect on Linux virtual machines

**Describe the issue**
The HiDPI checkbox on Display Resolution seems to have no effect with Apple Virtualization

**Configuration**
* UTM Version: 4.0.9
* macOS Version: 13.0.1
* Mac Chip (Intel, M1, ...): M2 on MacBook Air

**Steps to Reproduce**
1. Create a VM in UTM using Apple Virtualization
2. Change display resolution to 1440x900 and check HiDPI box
3. Install Ubuntu and KDE, or preferred desktop environment

**Observed Behavior**
The resolution appears in the guest as 1440x900 and is blurry

**Expected Behavior**
HiDPI enabled, basically the resolution presented to the guest should be doubled.

**Workaround**
Uncheck HiDPI box and double resolution. For example, set resolution to 2880x1800 and inside the guest set scaling factor 200% to achieve sharp and crisp look.