Remove old import

python/dune/codegen/pdelab/adjoint.py

@@ -21,7 +21,6 @@ from dune.codegen.generation import (accumulation_mixin,
 from dune.codegen.options import (get_form_option,
                                   )
 from dune.codegen.loopy.target import dtype_floatingpoint
-from dune.codegen.pdelab import PDELabInterface
 from dune.codegen.pdelab.localoperator import (boundary_predicates,
                                                determine_accumulation_space,
                                                extract_kernel_from_cache,