Fix book signing

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/BedrockBookEditTranslator.java

@@ -104,6 +104,9 @@ public class BedrockBookEditTranslator extends PacketTranslator<BookEditPacket>
                     }
                     break;
                 }
+                case SIGN_BOOK: {
+                    break;
+                }
                 default:
                     return;
             }