fix: correctly apply CTNP_TESTING_COMPAT_SOURCE_LOC in build workflow

Author: DNKpp

.github/workflows/build.yml

@@ -292,7 +292,7 @@ jobs:
         if: ${{ matrix.config.compat_source_loc }}
         shell: bash
         run: |
-          echo "CMAKE_BASE_OPTIONS=$(echo ${CMAKE_BASE_OPTIONS} -CTNP_TESTING_COMPAT_SOURCE_LOC=ON)" >> $GITHUB_ENV
+          echo "CMAKE_BASE_OPTIONS=$(echo ${CMAKE_BASE_OPTIONS} -DCTNP_TESTING_COMPAT_SOURCE_LOC=ON)" >> $GITHUB_ENV
 
       - name: Setup macOS
         if: startsWith(matrix.config.os, 'macOS')