Fix a typo that make pdftk not working in Mandriva 2006.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5015 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/PDFForm.py

@@ -92,7 +92,7 @@ class PDFTk :
 
     out = self._getOutput(
           PDFTK_EXECUTABLE+
-          " %s fill_form %s output - flattern "%(
+          " %s fill_form %s output - flatten "%(
           pdfFormFileName, fdfFormFileName))
     os.remove(fdfFormFileName)
     os.remove(pdfFormFileName)