Remove unused import

Signed-off-by: David Fuelling <sappenin@gmail.com>

Author: sappenin

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/transactions/Transaction.java

@@ -28,7 +28,6 @@
 import com.google.common.collect.BiMap;
 import com.google.common.collect.ImmutableBiMap.Builder;
 import com.google.common.primitives.UnsignedInteger;
-import com.sun.org.apache.bcel.internal.util.BCELifier.FLAGS;
 import org.immutables.value.Value;
 import org.slf4j.LoggerFactory;
 import org.xrpl.xrpl4j.crypto.keys.PublicKey;