dont install validation tools on mariner

Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>

Author: simongdavies

.github/workflows/pr-validate.yml

@@ -143,7 +143,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install PDF test dependencies
-        if: matrix.hypervisor != 'whp'
+        if: matrix.hypervisor == 'kvm'
         run: |
           sudo apt-get update -qq
           sudo apt-get install -y -qq poppler-utils qpdf fonts-dejavu-core