fdo#60250: InsertNewPage: copy margins for mirrored pages
fdo#60250: InsertNewPage: copy margins for mirrored pages

When there is no explicit first page, set the proper left or right
margins, which are different for mirrored page styles.
(regression from a964cf666abb0c4df4e29ea8709532b7d45c104f)

Change-Id: I56ccc6f7987accefc27d627d2427ee37d83bd758

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