hard fork in maintenance

Author: Yrp

src/main/java/org/tron/core/db/DynamicPropertiesStore.java

@@ -10,7 +10,6 @@
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;
 import org.tron.common.utils.ByteArray;
-import org.tron.common.utils.ByteUtil;
 import org.tron.common.utils.Sha256Hash;
 import org.tron.core.capsule.BytesCapsule;
 import org.tron.core.config.Parameter;
@@ -1411,7 +1410,7 @@ public byte[] statsByVersion(int version) {
     String statsKey = FORK_PREFIX + version;
     return revokingDB.getUnchecked(statsKey.getBytes());
   }
-  
+
   public boolean getForked() {
     byte[] value = revokingDB.getUnchecked(FORK_CONTROLLER);
     return value == null ? Boolean.FALSE : Boolean.valueOf(new String(value));