Qt: fix crash when opening/saving IP map on Windows

According to https://bugreports.qt.io/browse/QTBUG-20372 you need to close a QFile before calling fclose, otherwise it leads to an unexpected behavior. Let's duplicate the file handle to avoid this issue as suggested in https://stackoverflow.com/questions/9465727/convert-qfile-to-file

Closes #17074 (closed)

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• 81f242f9 - Qt: fix crash when opening/saving IP map on Windows

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changed title from Qt: fix crash when opeining.saving IP map on Windows to Qt: fix crash when opening/saving IP map on Windows

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• 1142a44f - Qt: fix crash when opening/saving IP map on Windows

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• 746051d0 - Qt: fix crash when opening/saving IP map on Windows

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