fdo#74747: Correctly inspect formula result value for xlsx export.
fdo#74747: Correctly inspect formula result value for xlsx export.

Change-Id: I757a8eb371b432970885e2fbd6aea9dd965ab5c0

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