Fix typo in kwarg in SpikeDetection (#19282)

Author: mjbommar

Diff for: src/lightning/fabric/utilities/spike.py

@@ -166,7 +166,7 @@ def load_state_dict(self, state_dict: Dict[str, Any]) -> None:
         self.warmup = state_dict.pop("warmup")
         self.atol = state_dict.pop("atol")
         self.rtol = state_dict.pop("rtol")
-        self.bad_batches = state_dict.pop("bad_bachtes")
+        self.bad_batches = state_dict.pop("bad_batches")
         self.exclude_batches_path = state_dict.pop("bad_batches_path")
         self.running.load_state_dict(state_dict.pop("running"))
         self.running_mean.base_metric.load_state_dict(state_dict.pop("mean"))