resolved fdo#49639 import .xls with HTML as such, not CSV
resolved fdo#49639 import .xls with HTML as such, not CSV

This restores the previous behavior for this content type, regression
introduced with the fix for fdo#40021 a5eadc6aaafec92df23c57e258882a2c98ece0ad

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