STY: Put __init__ first

Just for convention, put __init__ as the first member of the class ViewerPreferences.

pypdf/generic/_viewerpref.py

@@ -47,7 +47,7 @@ def __init__(self, obj: Optional[DictionaryObject] = None) -> None:
             self.indirect_reference = obj.indirect_reference  # type: ignore
         except AttributeError:
             pass
-    
+
     def _get_bool(self, key: str, default: Optional[BooleanObject]) -> BooleanObject:
         return self.get(key, default)