fix: removed unused default_runcard dictionary

src/qibotn/backends/abstract.py

@@ -3,16 +3,6 @@ from abc import abstractmethod
 from qibo.backends.numpy import NumpyBackend
 from qibo.config import raise_error
 
-DEFAULT_CONFIGURATION = {
-    "MPI_enabled": False,  # TODO: cutensornet specific, TBRemoved
-    "NCCL_enabled": False,  # TODO: cutensornet specific, TBRemoved
-    "expectation_enabled": False,
-    "pauli_string_pattern": None,
-    "MPS_enabled": False,
-    "gate_algo": None,
-    "mps_opts": None,
-}
-
 
 class QibotnBackend(NumpyBackend):