Use minimal required diff to 0 for multi-objective ablations

Author: Sarah Krebs

deepcave/evaluators/mo_ablation.py

@@ -315,7 +315,7 @@ def ablation(
             continue_ablation, max_hp, max_hp_performance, max_hp_std
         """
         max_hp = ""
-        max_hp_difference = -np.inf
+        max_hp_difference = 0
 
         for hp in hp_it:
             if hp in incumbent_config.keys() and hp in self.default_config.keys():