fix sort order for shard_epochs table

Author: belliottsmith

src/java/org/apache/cassandra/db/virtual/AccordDebugKeyspace.java

@@ -2160,7 +2160,7 @@ private ShardEpochsTable()
                         "  quorum_fast_privileged_deps int,\n" +
                         "  quorum_fast_privileged_nodeps int,\n" +
                         "  token_end 'TokenUtf8Type',\n" +
-                        "  PRIMARY KEY (table_id, token_start, epoch_start)" +
+                        "  PRIMARY KEY (table_id, token_start, epoch_start DESC)" +
                         ')', UTF8Type.instance), FAIL, ASC);
         }