fdo#74745: (DOCX) Number formatting for custom document properties.

Change-Id: Ifb9ef14180cac84fd111d81b9535266476d5f04f
Reviewed-on: https://gerrit.libreoffice.org/9896
Reviewed-by: Muthu Subramanian K <muthusuba@gmail.com>
Tested-by: Muthu Subramanian K <muthusuba@gmail.com>