Modify CMakeLists.txt for apps directory

apps/CMakeLists.txt

-cmake_minimum_required( VERSION 3.24 )
-
-project ( test_pymatlib )
-
-#   waLBerla Options
-
-SET ( WALBERLA_BUILD_TESTS OFF )
-SET ( WALBERLA_BUILD_BENCHMARKS OFF )
-SET ( WALBERLA_BUILD_TOOLS OFF )
-SET ( WALBERLA_BUILD_TUTORIALS OFF )
-SET ( WALBERLA_BUILD_SHOWCASES OFF )
-SET ( WALBERLA_BUILD_DOC OFF )
-
-SET ( WALBERLA_BUILD_WITH_PYTHON OFF )
-SET ( WALBERLA_BUILD_WITH_CODEGEN OFF )
-SET ( WALBERLA_BUILD_WITH_OPENMP ON )
-SET ( WALBERLA_BUILD_WITH_MPI OFF )
-
-add_subdirectory( walberla )
-add_subdirectory( sfg-walberla )
+add_subdirectory(walberla)
+add_subdirectory(sfg-walberla)
 
 walberla_add_executable ( NAME HeatEquationWithMaterial
         FILES CodegenHeatEquationWithMaterial.cpp
@@ -27,4 +9,4 @@ pystencilssfg_generate_target_sources( HeatEquationWithMaterial
         SCRIPTS HeatEquationKernelWithMaterial.py
         FILE_EXTENSIONS .cpp .h
         OUTPUT_MODE standalone
-)
+)
\ No newline at end of file