Fixed f-string issue in config.py

Author: dhondta

src/sploitkit/core/components/config.py

@@ -300,7 +300,7 @@ def __repr__(self):
 
     def __str__(self):
         """ Custom string method. """
-        return f"<{self.name}[{["N", "Y"][self.required]}]>"
+        return f"<{self.name}[{'NY'[self.required]}]>"
 
     def __set_func(self, func, name, default_func=None):
         """ Set a function, e.g. for manipulating option's value. """