fdo#78159 Restore EXPORT to ODF 1.0 for Math

Partially revert commit aeeaccf59abbc485d7786486f1accc1cb4d4dbf7
It is a quick fix for 4-2 since AutoText "FN" (Formula Numbering) is broken

Change-Id: I22daf58bf31f61a05a981ed1db9a81f2d8dc3859
Reviewed-on: https://gerrit.libreoffice.org/9319
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>