fdo#49571: ODF import: ignore "text:enable-numbering" attribute
fdo#49571: ODF import: ignore "text:enable-numbering" attribute

It has been imported as an alien attribute since CWS impressodf12
5b364c2e8baf9b1f6bbe611c0fd6895a88056afc, and could not be written
to a document created from scratch anyway.

Change-Id: I054fcf71d7ddc3ed19735b8aa898d1b1a12db5b9

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core