Remove unused constant evaluators

Author: timgrein

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/operator/EvalOperator.java

@@ -220,13 +220,13 @@ record Factory() implements ExpressionEvaluator.Factory {
             @Override
             public ConstantTrueEvaluator get(DriverContext context) {
                 return new ConstantTrueEvaluator(context);
-            }
+            };
 
             @Override
             public String toString() {
                 return NAME;
             }
-        }
+        };
     }
 
     public static final ExpressionEvaluator.Factory CONSTANT_TRUE_FACTORY = new ConstantTrueEvaluator.Factory();