fixup! Return proper error when user tries to enable transactions

Author: findepi

clickhouse-jdbc/src/main/java/ru/yandex/clickhouse/ClickHouseConnectionImpl.java

@@ -227,7 +227,7 @@ public void commit() throws SQLException {
 
     @Override
     public void rollback() throws SQLException {
-        throw new SQLException("Cannot commit when auto-commit is enabled");
+        throw new SQLException("Cannot rollback when auto-commit is enabled");
     }
 
     @Override