Remove wrong feature tag (#1932)

test/language/statements/class/static-method-non-configurable-err.js

@@ -9,7 +9,6 @@ info: |
   10. Let desc be the PropertyDescriptor{[[Value]]: closure, [[Writable]]:
       true, [[Enumerable]]: enumerable, [[Configurable]]: true}.
   11. Return ? DefinePropertyOrThrow(object, propKey, desc). 
-features: [generators]
 ---*/
 
 assert.throws(TypeError, function() {