fix issue, then it wasn't possible to view FBD programs

the reason for that is possible wx-3.0-gtk2 bug that happens if
ALWAYS_SHOW_SB is set.

Traceback (most recent call last):
File "Beremiz.py", line 1045, in OnProjectTreeItemActivated
IDEFrame.OnProjectTreeItemActivated(self, event)
File "IDEFrame.py", line 1667, in OnProjectTreeItemActivated
self.EditProjectElement(item_infos["type"], item_infos["tagname"])
File "IDEFrame.py", line 1752, in EditProjectElement
new_window = Viewer(self.TabsOpened, tagname, self, self.Controler)
File "editors/Viewer.py", line 611, in __init__
EditorPanel.__init__(self, parent, tagname, window, controler, debug)
File "editors/EditorPanel.py", line 68, in __init__
self._init_ctrls(parent)
File "editors/EditorPanel.py", line 52, in _init_ctrls
self._init_Editor(self)
File "editors/Viewer.py", line 603, in _init_Editor
style=wx.HSCROLL | wx.VSCROLL | wx.ALWAYS_SHOW_SB)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_windows.py", line 296, in __init__
_windows_.ScrolledWindow_swiginit(self,_windows_.new_ScrolledWindow(*args, **kwargs))
PyAssertionError: C++ assertion "scrolled" failed at ../src/gtk/scrolwin.cpp(205) in DoShowScrollbars(): window must be created

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<?xml version="1.0" encoding="ISO-8859-1" ?>

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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"

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            xmlns:xhtml="http://www.w3.org/1999/xhtml">

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  <xsd:element name="Python">

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    <xsd:complexType>

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      <xsd:annotation>

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        <xsd:documentation>Formatted text according to parts of XHTML 1.1</xsd:documentation>

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      </xsd:annotation>

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      <xsd:sequence>

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        <xsd:any namespace="http://www.w3.org/1999/xhtml" processContents="lax"/>

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      </xsd:sequence>

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    </xsd:complexType>

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  </xsd:element>

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</xsd:schema>