hotfix: add missing method in performance enum (lllyasviel#3154)

Author: mashb1t

modules/flags.py

@@ -155,6 +155,10 @@ class Performance(Enum):
     def list(cls) -> list:
         return list(map(lambda c: c.value, cls))
 
+    @classmethod
+    def values(cls) -> list:
+        return list(map(lambda c: c.value, cls))
+
     @classmethod
     def by_steps(cls, steps: int | str):
         return cls[Steps(int(steps)).name]