fix display of ARRAY fields inside of structure data types.

Previously ARRAY fields in structures were displayed, for example,
like 'ARRAY [1..2] OF ARRAY' instead of 'ARRAY [1..2] OF INT'. Because
of this error the array type can be really edited.

     1

from py_ext import *

     2

from PythonEditor import PythonEditor

     3

from PythonFileCTNMixin import PythonFileCTNMixin