[misc] correct Connection.prepareStatement(String sql, int[] columnIndexes/String[] columnNames) to return generated keys

Author: diego Dupin

src/main/java/org/mariadb/jdbc/Connection.java

@@ -579,12 +579,12 @@ public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) thr
 
  @Override
  public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
- return prepareStatement(sql);
+ return prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
  }
 
  @Override
  public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
- return prepareStatement(sql);
+ return prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
  }
 
  @Override