fix close button in system menu for AboutDialog on Windows


If SetEscapeId receives wx.ID_CLOSE as parameter, then on Windows with
wxPython 2.8 system close button in title bar stops working.
If wx.ID_CANCEL or wx.ID_OK is used in SetEscapeId call, then close
button works correctly.

.project

syntax: regexp
^tests/.*/build$
^.idea/.*
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^.*\.pyc$
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^.*~$
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^.*\.swp$

bug_report.*\.txt
i18n/.*.new$
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