CI: Fix name of non-upgrade test artifacts

Previously an erroneous 'False' was appended to the artifact name.

Author: markgoddard

.github/workflows/stackhpc-all-in-one.yml

@@ -383,7 +383,7 @@ jobs:
       - name: Upload test result artifacts
         uses: actions/upload-artifact@v4
         with:
-          name: test-results-${{ inputs.os_distribution }}-${{ inputs.os_release }}-${{ inputs.neutron_plugin }}${{ inputs.upgrade && '-upgrade' }}
+          name: test-results-${{ inputs.os_distribution }}-${{ inputs.os_release }}-${{ inputs.neutron_plugin }}${{ inputs.upgrade && '-upgrade' || '' }}
           path: |
             tempest-artifacts/
             sot-results/