[bugfix][ci] enable grid selector.

.gitlab-ci.yml

 ---
 variables:
-  DUNE_CMAKE_FLAGS:   "-DDUNE_ENABLE_PYTHONBINDINGS=ON -DDUNE_MAX_TEST_CORES=4 -DBUILD_SHARED_LIBS=TRUE -DDUNE_PYTHON_INSTALL_LOCATION=none -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_LATEX=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Vc=TRUE -DCMAKE_DISABLE_DOCUMENTATION=TRUE"
+  DUNE_CMAKE_FLAGS:   "-DDUNE_ENABLE_PYTHONBINDINGS=ON -DDUNE_GRID_GRIDTYPE_SELECTOR=ON -DDUNE_MAX_TEST_CORES=4 -DBUILD_SHARED_LIBS=TRUE -DDUNE_PYTHON_INSTALL_LOCATION=none -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_LATEX=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Vc=TRUE -DCMAKE_DISABLE_DOCUMENTATION=TRUE"
   DUNECI_CMAKE_FLAGS: $DUNE_CMAKE_FLAGS
   DUNE_CONTROL_PATH:  /duneci/modules:$CI_PROJECT_DIR
   DUNE_PY_DIR:        /duneci/modules/dune-py
@@ -22,7 +22,6 @@ debian-11-gcc-9-17:
     - duneci-standard-test
   variables:
     DUNECI_TOOLCHAIN:  gcc-9-17
-    DUNE_CMAKE_FLAGS:  "-DDUNE_ENABLE_PYTHONBINDINGS=OFF -DDUNE_MAX_TEST_CORES=4 -DBUILD_SHARED_LIBS=TRUE -DDUNE_PYTHON_INSTALL_LOCATION=none -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_LATEX=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Vc=TRUE -DCMAKE_DISABLE_DOCUMENTATION=TRUE"
 
 ubuntu-20.04-gcc-9-17:
   image: registry.dune-project.org/docker/ci/ubuntu:20.04