fix bash conditional

Author: berquist

.github/workflows/build-spack-nodeps.yml

@@ -70,7 +70,7 @@ jobs:
           spack add binutils@2.41
           spack add sst-core@${{ matrix.version }}
           spack add sst-elements@${{ matrix.version }}
-          if [[ "${{ matrix.version }}" != "13.1.0" ]] && [[ "$(uname)" != "Darwin" ]]; then
+          if ! [[ "${{ matrix.version }}" == "13.1.0" ]] && [[ "$(uname)" == "Darwin" ]]; then
               spack add sst-macro@${{ matrix.version }}
           fi
           spack concretize --reuse --force