fix issue, when structure data type with array field is created

Traceback (most recent call last):
File "editors/DataTypeEditor.py", line 669, in ElementArrayTypeFunction
self.RefreshTypeInfos()
File "editors/DataTypeEditor.py", line 761, in RefreshTypeInfos
self.Controler.SetDataTypeInfos(self.TagName, infos)
File "PLCControler.py", line 2075, in SetDataTypeInfos
array.baseType.setcontent(PLCOpenParser.CreateElement(
AttributeError: 'lxml.etree._Element' object has no attribute 'setcontent'

from editors.TextViewer import TextViewer
from plcopen.plcopen import TestTextElement

class IECCodeViewer(TextViewer):
    
    def __del__(self):
        TextViewer.__del__(self)
        if getattr(self, "_OnClose"):
            self._OnClose(self)
    
    def Paste(self):
        if self.Controler is not None:
            TextViewer.Paste(self)
    
    def Search(self, criteria):
        return [((self.TagName, "body", 0),) + result for result in TestTextElement(self.Editor.GetText(), criteria)]