fdo#57499: VclContainer: enable child transparent mode
fdo#57499: VclContainer: enable child transparent mode

Change-Id: I42aa0c578a927777725e5be4f8534f68bc709cd6

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