delete unused varible DBBACKUP_CONF

Author: 317787106

framework/src/test/java/org/tron/common/TestConstants.java

@@ -25,7 +25,6 @@ public class TestConstants {
   public static final String TEST_CONF = "config-test.conf";
   public static final String NET_CONF = "config.conf";
   public static final String MAINNET_CONF = "config-test-mainnet.conf";
-  public static final String DBBACKUP_CONF = "config-test-dbbackup.conf";
   public static final String LOCAL_CONF = "config-localtest.conf";
   public static final String STORAGE_CONF = "config-test-storagetest.conf";
   public static final String INDEX_CONF = "config-test-index.conf";