MNT: Apply refurb suggestion

[FURB118]: Replace lambda with `operator.eq`

Author: DimitriPapadopoulos

nibabel/nicom/dicomwrappers.py

@@ -737,7 +737,7 @@ def series_signature(self):
         ice = csar.get_ice_dims(self.csa_header)
         if ice is not None:
             ice = ice[:6] + ice[8:9]
-        signature['ICE_Dims'] = (ice, lambda x, y: x == y)
+        signature['ICE_Dims'] = (ice, operator.eq)
         return signature
 
     @one_time