fix: param "value" from entity.change_stat is now optional

the default is set to 0

Entities.py

@@ -528,7 +528,7 @@ def remove_effect_by_index(self, index: int = -1) -> bool:
         except:
             return False
 
-    def change_stat(self, effect: str, value: int | float) -> bool:
+    def change_stat(self, effect: str, value: int | float = 0) -> bool:
         """
         changes stat (effect.infl) by value