Fixed saving a document xltx, xltm to xlsx and xlsm respectively
Created originally on Bitbucket by pikhovkin (Sergey Pikhovkin)
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Fixed saving a document xltx, xltm to xlsx and xlsm respectively.
If document save from xltm template (it was created in MSExcel) to xlsm by openpyxl, then later MSExcel cann't open this document.