gst-build: Disable vs2017 x86 job too

gst-build: Disable vs2017 x86 job too

This might be related to the same issue described in the previous
commit: Till we can update the container image to the Feb 11 security
update, x86 executables and in general the container image will behave
badly because of:

https://support.microsoft.com/en-us/help/4542617/you-might-encounter-issues-when-using-windows-server-containers-with-t

vs2017 x86 has been failing with a runner system failure while
uploading artifacts / submitting job status:

```
Uploading artifacts...
gst-build/build/meson-logs/: found 2 matching files
WARNING: Failed to load system CertPool: crypto/x509: system root pool is not available on Windows
ERROR: Job failed (system failure): aborted: <nil>
```

https://gitlab.freedesktop.org/slomo/gst-plugins-good/-/jobs/2084184

Disable it for now.