[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] `primitiveScreenScaleFactor` broken on headless Linux/X11 VMs (Issue #625)

For a few days, `primitiveScreenScaleFactor` fails on headless Linux/X11 VMs. Reprocase:

1. Download and extract the latest AiO bundle from today 2. ```bash $ cat << EOF > test.st TranscriptStream redirectToStdOut: true. Transcript showln: DisplayScreen actualScreenScaleFactor asString. EOF $ ./squeak.sh --headless "$(realpath test.st)" ``` 3. stack overflow: ``` DisplayScreen>>#actualScreenScaleFactor

stack page bytes 8192 available headroom 5576 minimum unused headroom 6016

(Segmentation fault) Aborted (core dumped) ```

8 days again, this still worked. See also: https://github.com/LinqLover/create-image/actions/workflows/test.yml

@marceltaeumel Does this require a fix similar to 2a0e7851d0e057b06e77e64a58e155d9c7935e6a?

PS: I noted a still existing typo here: https://sourcegraph.com/search?q=context:global+ioSceenScaleFactor+repo:%5Eg...