fix test

Author: khvn26

src/test/java/com/flagsmith/flagengine/models/FlagsTest.java

@@ -17,14 +17,12 @@ public void testFromEvaluationResult__metadata__expected() throws FlagsmithClien
     com.flagsmith.flagengine.Flags flagResults = new com.flagsmith.flagengine.Flags()
       .withAdditionalProperty("feature_1", new FlagResult()
         .withEnabled(true)
-        .withFeatureKey("feature_1")
         .withName("Feature 1")
         .withValue("value_1")
         .withReason("DEFAULT")
         .withMetadata(Map.of("flagsmithId", 1)))
       .withAdditionalProperty("feature_2", new FlagResult()
         .withEnabled(false)
-        .withFeatureKey("feature_2")
         .withName("Feature 2")
         .withValue(null)
         .withReason("DEFAULT")