Removed use of aes

Author: dghgit

core/src/main/java/org/bouncycastle/pqc/crypto/mlkem/MLKEMEngine.java

@@ -177,15 +177,7 @@ public MLKEMEngine(int k)
         this.CryptoPublicKeyBytes = KyberPublicKeyBytes;
         this.CryptoCipherTextBytes = KyberCipherTextBytes;
 
-
-        if(usingAes)
-        {
-            symmetric = new Symmetric.AesSymmetric();
-        }
-        else
-        {
-            symmetric = new Symmetric.ShakeSymmetric();
-        }
+        this.symmetric = new Symmetric.ShakeSymmetric();
 
         this.indCpa = new MLKEMIndCpa(this);
     }