removed duplicate adding of certificate request preparator

Author: ic0ns

TLS-Core/src/main/java/de/rub/nds/tlsattacker/core/protocol/preparator/CertificateRequestPreparator.java

@@ -11,7 +11,6 @@
 
 import de.rub.nds.modifiablevariable.util.ArrayConverter;
 import de.rub.nds.tlsattacker.core.constants.ClientCertificateType;
-import de.rub.nds.tlsattacker.core.constants.ProtocolVersion;
 import de.rub.nds.tlsattacker.core.constants.SignatureAndHashAlgorithm;
 import de.rub.nds.tlsattacker.core.exceptions.PreparationException;
 import de.rub.nds.tlsattacker.core.protocol.message.CertificateRequestMessage;
@@ -45,7 +44,6 @@ public void prepareHandshakeMessageContents() {
             sigHashAlgos = convertSigAndHashAlgos(chooser.getServerSupportedSignatureAndHashAlgorithms());
             prepareSignatureHashAlgorithms(msg);
             prepareSignatureHashAlgorithmsLength(msg);
-            msg.addExtension(new SignatureAndHashAlgorithmsExtensionMessage());
             prepareExtensions();
             prepareExtensionLength();
         } else {