Fix issues with members

Author: oerc0122

MDMC/refinement/FoM/FoM_abs.py

@@ -65,9 +65,9 @@ def _missing_(cls, value: Union[str, None]):
         if not isinstance(value, str):
             return None
 
-        value = value.lower()
-        for member in cls:
-            if member.name == value:
+        value = value.upper()
+        for name, member in cls.__members__.items():
+            if name == value:
                 return member