ci: fix standalone branch suffix input (#932)

Author: PProfizi

.github/workflows/ci.yml

@@ -108,7 +108,7 @@ jobs:
           # Upload the wheel artifact for only one of the OS as it is OS-agnostic
           wheel: ${{ (matrix.python-version == env.MAIN_PYTHON_VERSION) && (matrix.os == 'windows-latest') }}
           wheelhouse: true
-          standalone_suffix: ${{ inputs.standalone_suffix || ''}}
+          standalone_suffix: ${{ inputs.standalone_branch_suffix || ''}}
 
       - name: "Prepare Testing Environment"
         uses: ansys/pydpf-actions/prepare_tests@v2.3